不定詞と動名詞って、どちらも「〜すること」って訳せるから混乱しがちだよね。でも実は、動詞によってどちらを使うかが決まってるし、使い方次第で意味も変わるんだ。この違いを理解すれば、テストでも確実に点が取れるようになるよ！
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Updated Apr 21, 2026
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不定詞・動名詞の完全ガイド
1 / 5
不定詞と動名詞の基本的な違い
**不定詞（to + 動詞の原形）**は「未来志向」のイメージを持ってる。これからやりたいことや、まだ実現していないことを表すことが多いんだ。例えば「I want to visit Kyoto.」は、これから京都に行きたいという気持ちを表してるよね。
一方、**動名詞（動詞のing形）**は「過去志向・反復・事実」のイメージ。すでにやったことや、習慣的にしていること、一般的な事実を指すことが多い。「I enjoy watching movies.」なら、映画を観るという行為そのものを楽しんでいるってことだ。
この「未来志向」と「過去志向」のイメージを覚えておけば、どの動詞がどちらを好むかが理解しやすくなるよ。覚えることは多いけど、パターンが見えてくれば大丈夫！
💡 ポイント: 不定詞は「これから」、動名詞は「すでに」というイメージで覚えよう！
不定詞だけをとる動詞と動名詞だけをとる動詞
不定詞（to do）のみをとる動詞は、未来のことや意志・決意を表すものが多い。want to do（〜したい）、decide to do（〜すると決める）、promise to do（〜すると約束する）、plan to do（〜する計画を立てる）などがその代表例だ。
動名詞（doing）のみをとる動詞は、反復・中断・完了・回避などを表すものが中心。enjoy doing（〜して楽しむ）、finish doing（〜し終える）、stop doing（〜するのをやめる）、avoid doing（〜するのを避ける）などは絶対に覚えておこう。
「Would you mind opening the window?」のように、mind doingは「〜するのを嫌がる」という意味で、丁寧な依頼でよく使われるから要チェックだ。
💡 ポイント: enjoy, finish, stopなどの頻出動詞は動名詞とセットで覚えよう！
意味が変わる重要な動詞
ここがテストで一番狙われるポイント！remember, forget, try, stopは不定詞と動名詞で意味が大きく変わるんだ。
remember to doは「これから〜することを覚えている」、remember doingは「過去に〜したことを覚えている」。「Remember to lock the door.」（ドアに鍵をかけるのを忘れないで）と「I remember seeing him before.」（以前彼に会ったのを覚えてる）では全然違うよね。
try to doは「〜しようと努力する」、try doingは「試しに〜してみる」。前者は頑張ったけどできなかった場合が多く、後者は実際にやってみたという意味になる。
stop to doは「〜するために立ち止まる」（目的）、stop doingは「〜することをやめる」（中断）。この違いは文の構造も違うから特に注意が必要だ。
💡 ポイント: remember, forget, try, stopは例文とセットで覚えると間違えない！
実践問題で理解を深めよう
実際の問題を解いてみよう。「()にstudyを適切な形で入れる」問題で考え方をチェックだ。
「I hope () abroad in the future.」なら、hopeは未来志向の動詞だからto studyが正解。「My brother gave up () to be a doctor.」は、give upが動名詞をとる動詞なのでstudyingになる。
「Please remember () for the test tomorrow.」は「明日の」テストのために「これから」勉強することだからto study。「I remember () with him last year.」は「去年」という過去のことを覚えているからstudyingが答えだ。
このように、動詞の性質と時制のイメージを組み合わせて考えれば、迷わずに答えが出せるようになるよ。
💡 ポイント: 時を表す語句（tomorrow, last year）も判断の手がかりにしよう！
覚えておきたい特別なルール
前置詞の後ろは必ず動名詞というルールは絶対に覚えておこう。「I'm looking forward to seeing you.」のtoは前置詞だから、後ろには動名詞のseeingが来るんだ。不定詞のtoと前置詞のtoを見分けるのがポイントだよ。
使役動詞・知覚動詞の後ろでは原形不定詞（toなし）を使う。「My mother made me clean my room.」「I saw him cross the street.」のように、make, have, let（使役）やsee, hear, feel（知覚）の後ではtoをつけないから注意しよう。
テスト前の最終確認として、不定詞は「未来・これから」、動名詞は「過去・習慣・事実」、意味が変わる4つの動詞（remember, forget, try, stop）、前置詞+動名詞、使役・知覚動詞+原形不定詞を必ずチェックしておこう。
💡 ポイント: 前置詞のtoと不定詞のtoの違いを見極められれば、ミスが大幅に減る！
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in 英語コミュニケーション
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
不定詞・動名詞の完全ガイド
不定詞と動名詞って、どちらも「〜すること」って訳せるから混乱しがちだよね。でも実は、動詞によってどちらを使うかが決まってるし、使い方次第で意味も変わるんだ。この違いを理解すれば、テストでも確実に点が取れるようになるよ！
不定詞と動名詞の基本的な違い
**不定詞（to + 動詞の原形）**は「未来志向」のイメージを持ってる。これからやりたいことや、まだ実現していないことを表すことが多いんだ。例えば「I want to visit Kyoto.」は、これから京都に行きたいという気持ちを表してるよね。
一方、**動名詞（動詞のing形）**は「過去志向・反復・事実」のイメージ。すでにやったことや、習慣的にしていること、一般的な事実を指すことが多い。「I enjoy watching movies.」なら、映画を観るという行為そのものを楽しんでいるってことだ。
この「未来志向」と「過去志向」のイメージを覚えておけば、どの動詞がどちらを好むかが理解しやすくなるよ。覚えることは多いけど、パターンが見えてくれば大丈夫！
💡 ポイント: 不定詞は「これから」、動名詞は「すでに」というイメージで覚えよう！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
不定詞だけをとる動詞と動名詞だけをとる動詞
不定詞（to do）のみをとる動詞は、未来のことや意志・決意を表すものが多い。want to do（〜したい）、decide to do（〜すると決める）、promise to do（〜すると約束する）、plan to do（〜する計画を立てる）などがその代表例だ。
動名詞（doing）のみをとる動詞は、反復・中断・完了・回避などを表すものが中心。enjoy doing（〜して楽しむ）、finish doing（〜し終える）、stop doing（〜するのをやめる）、avoid doing（〜するのを避ける）などは絶対に覚えておこう。
「Would you mind opening the window?」のように、mind doingは「〜するのを嫌がる」という意味で、丁寧な依頼でよく使われるから要チェックだ。
💡 ポイント: enjoy, finish, stopなどの頻出動詞は動名詞とセットで覚えよう！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
意味が変わる重要な動詞
ここがテストで一番狙われるポイント！remember, forget, try, stopは不定詞と動名詞で意味が大きく変わるんだ。
remember to doは「これから〜することを覚えている」、remember doingは「過去に〜したことを覚えている」。「Remember to lock the door.」（ドアに鍵をかけるのを忘れないで）と「I remember seeing him before.」（以前彼に会ったのを覚えてる）では全然違うよね。
try to doは「〜しようと努力する」、try doingは「試しに〜してみる」。前者は頑張ったけどできなかった場合が多く、後者は実際にやってみたという意味になる。
stop to doは「〜するために立ち止まる」（目的）、stop doingは「〜することをやめる」（中断）。この違いは文の構造も違うから特に注意が必要だ。
💡 ポイント: remember, forget, try, stopは例文とセットで覚えると間違えない！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
実践問題で理解を深めよう
実際の問題を解いてみよう。「()にstudyを適切な形で入れる」問題で考え方をチェックだ。
「I hope () abroad in the future.」なら、hopeは未来志向の動詞だからto studyが正解。「My brother gave up () to be a doctor.」は、give upが動名詞をとる動詞なのでstudyingになる。
「Please remember () for the test tomorrow.」は「明日の」テストのために「これから」勉強することだからto study。「I remember () with him last year.」は「去年」という過去のことを覚えているからstudyingが答えだ。
このように、動詞の性質と時制のイメージを組み合わせて考えれば、迷わずに答えが出せるようになるよ。
💡 ポイント: 時を表す語句（tomorrow, last year）も判断の手がかりにしよう！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
覚えておきたい特別なルール
前置詞の後ろは必ず動名詞というルールは絶対に覚えておこう。「I'm looking forward to seeing you.」のtoは前置詞だから、後ろには動名詞のseeingが来るんだ。不定詞のtoと前置詞のtoを見分けるのがポイントだよ。
使役動詞・知覚動詞の後ろでは原形不定詞（toなし）を使う。「My mother made me clean my room.」「I saw him cross the street.」のように、make, have, let（使役）やsee, hear, feel（知覚）の後ではtoをつけないから注意しよう。
テスト前の最終確認として、不定詞は「未来・これから」、動名詞は「過去・習慣・事実」、意味が変わる4つの動詞（remember, forget, try, stop）、前置詞+動名詞、使役・知覚動詞+原形不定詞を必ずチェックしておこう。
💡 ポイント: 前置詞のtoと不定詞のtoの違いを見極められれば、ミスが大幅に減る！
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Most popular content in 英語コミュニケーション
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user