The short version: 前に means before and always takes the dictionary form: 寝る前に. 後で means after and always takes the た-form: 食べた後で. With nouns, add の: 食事の前に, 授業の後で. てから joins two actions in strict order: 手を洗ってから食べます. The form never follows the tense of the sentence, so a past story still says 日本に来る前に.
English says “before I came to Japan” and “after I finish work”, so the verb inside the clause follows the time of the whole sentence. Japanese does something different, and it is the reason learners keep writing 来た前に. Once you see what Japanese is tracking, all three patterns become easy.
The picture: two events on one line
brush teeth
go to bed
At the time of brushing, going to bed has not happened yet, so 寝る stays in the dictionary form.
At the time of going to bed, brushing has already happened, so 磨く goes into the た-form.
Japanese chooses the verb form by asking one question: at the moment of the main action, has this other event happened yet? Before an event, it has not, so the verb is in the dictionary form. After an event, it has, so the verb is in the た-form. Whether you are telling a story about last year or making a plan for tomorrow does not change the answer.
前に: before
寝る前に、歯を磨きます。ねるまえに、はをみがきます。I brush my teeth before I go to bed.
出かける前に、窓を閉めてください。でかけるまえに、まどをしめてください。Please close the windows before you go out.
食事の前に、手を洗いましょう。しょくじのまえに、てをあらいましょう。Let's wash our hands before the meal.
Now the sentence that catches almost everyone. In a past story, English moves the verb into the past (“before I came”), but Japanese keeps it in the dictionary form, because at the time of studying the coming had not happened yet.
日本に来た前に、日本語を勉強しました。にほんにきたまえに、にほんごをべんきょうしました。
日本に来る前に、日本語を勉強しました。にほんにくるまえに、にほんごをべんきょうしました。Before I came to Japan, I studied Japanese.
後で: after
ご飯を食べた後で、散歩します。ごはんをたべたあとで、さんぽします。After I eat, I go for a walk.
授業の後で、先生に質問しました。じゅぎょうのあとで、せんせいにしつもんしました。After class, I asked the teacher a question.
明日、仕事が終わる後で電話します。あした、しごとがおわるあとででんわします。
明日、仕事が終わった後で電話します。あした、しごとがおわったあとででんわします。Tomorrow I'll call you after I finish work.
You will also see 後 used without で: 食べた後、散歩します. The meaning is the same. 後に is also possible and sounds more formal. For speaking, 後で is the safe choice.
後で on its own: later
Without anything in front of it, 後で simply means later, and it is one of the most useful words in daily conversation:
Later
後で電話します。
あとででんわします。I'll call you later.See you later
じゃあ、また後で。
じゃあ、またあとで。See you later, then.てから: first this, then that
The て-form plus から (literally “from having done”) joins two actions in strict order. The first action is finished before the second one begins.
手を洗ってから、食べてください。てをあらってから、たべてください。Please wash your hands first, then eat.
宿題をしてから、ゲームをします。しゅくだいをしてから、ゲームをします。I'll do my homework, and then I'll play games.
電話してから来てください。でんわしてからきてください。Please call before you come. (Call first, then come.)
てから or 後で?
In many sentences both are correct and the meaning hardly changes: 宿題をしてから遊びます and 宿題をした後で遊びます both say that homework comes first. The difference is one of emphasis, and there are two places where only one of them works.
てから stresses the order
Use it for instructions and procedures, where doing A first matters: 電話してから来てください. It is also the only one that can mean since:日本に来てから、三年になります。
にほんにきてから、さんねんになります。It has been three years since I came to Japan.後で stresses the time
Use it when B simply happens at some point after A, possibly with a gap: 試験が終わった後で、旅行します (after the exams are over, I'll travel). It is also the only one that can stand alone as later: 後でね.Ago and later: 三年前, 三日後
When 前 and 後 follow a length of time, they mean ago and later, and they attach directly, without の. In this use, 後 is read ご.
| Japanese | Reading | Meaning |
|---|---|---|
| 三年前 | さんねんまえ | three years ago |
| 一週間前 | いっしゅうかんまえ | a week ago |
| 十分前 | じゅっぷんまえ | ten minutes ago / ten minutes before |
| 三日後 | みっかご | three days later / in three days |
| 一年後 | いちねんご | a year later |
Check yourself: six sentences
Tap the form that fits. Each answer explains the rule.
日本へ __ 前に、ひらがなを覚えました。にほんへ __ まえに、ひらがなをおぼえました。Before I went to Japan, I learned hiragana.
前に always takes the dictionary form, even in a past sentence.
映画を __ 後で、ご飯を食べましょう。えいがを __ あとで、ごはんをたべましょう。Let's eat after we watch the film.
後で always takes the た-form, even for a plan.
テスト __ 前に、よく寝てください。テスト __ まえに、よくねてください。Get a good night's sleep before the test.
Noun + の + 前に.
大学に __、毎日忙しいです。だいがくに __、まいにちいそがしいです。I've been busy every day since I started university.
Only てから can mean since.
__、また来ます。__、またきます。I'll come again in three days.
With a length of time, 後 attaches directly and is read ご: 三日後.
今ちょっと忙しいので、__ 電話します。いまちょっといそがしいので、__ でんわします。I'm a bit busy now, so I'll call you later.
後で alone means later. てから always needs a verb in front of it.
Quick reference
- Before
- Dictionary form + 前に (寝る前に), or noun + の前に (食事の前に). Never た + 前に.
- After
- た-form + 後で (食べた後で), or noun + の後で (授業の後で). Never dictionary form + 後で.
- Why the form never changes
- It shows whether the event has happened at the time of the main action, not whether the sentence is past or future.
- First A, then B
- て-form + から: 手を洗ってから食べます.
- Since
- てから only: 日本に来てから三年になります.
- Later
- 後で alone: 後で電話します, また後で.
- Ago / later with time spans
- No の: 三年前 (さんねんまえ), 三日後 (みっかご).
Related Reading on Kanjijo
Frequently Asked Questions
Put 前に after a verb in the dictionary form or after a noun with の: 寝る前に (before sleeping), 食事の前に (before the meal). The verb stays in the dictionary form even in a past sentence: 日本に来る前に、日本語を勉強しました.
Put 後で after a verb in the た-form or a noun with の: 食べた後で (after eating), 授業の後で (after class). The verb stays in the た-form even when you talk about the future: 仕事が終わった後で電話します.
Because the form shows the order of events, not the time of speaking. At the moment you studied, coming to Japan had not happened yet, so the verb stays in the dictionary form. 来た前に is always wrong.
Often both work. てから stresses strict order (first A, then B) and is the natural choice for instructions such as 電話してから来てください. Only てから can mean since: 日本に来てから三年になります. Only 後で can stand alone as later: 後で電話します.
Attach 前 or 後 directly to the time span, without の: 三年前 (three years ago), 三日後 (three days later). Note that 後 is read ご in this use.
- Seiichi Makino & Michio Tsutsui, A Dictionary of Basic Japanese Grammar (The Japan Times, 1986): entries for mae (ni), ato de and kara (after doing).
- The Japan Foundation & JEES, JLPT Level Summary: what N5 and N4 candidates are expected to understand.
Put events in order without stopping to think
前に, 後で and てから are learned in an afternoon and become automatic only after many real sentences. Kanjijo gives you the full N5–N1 path of 2,480 kanji, 9,020 words and the complete grammar bank, with exclusive mnemonics for every kanji and every word, an SRS engine with seven growth stages that times each review, home, lock screen and interactive test widgets, JLPT reading and listening practice and full mock tests. Train your ear with conversation lessons, shadowing and dictation, point the OCR scanner at any Japanese text around you, and turn any Japanese video you paste in into a lesson. Free on iPhone.
Download Kanjijo Free