再 vs 又: Two Ways to Say “Again” (and Why 又 Can Talk About Tomorrow)

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Most learners are taught a tidy rule: 又 for the past, 再 for the future. It works until you hear a student groan 明天又是星期一了 on a Sunday evening, or sigh 下个月又要考试了 about exams that are still weeks away. Both sentences are about the future, and both use 又. The rule is not wrong, but it describes the usual result rather than the reason.

The rule in one table

Before you choose, ask one question: is this repeat a fact, or is it still a choice?

	又 yòu	再 zài
The repeat is	a fact: it happened, or it is certain	not real yet: wished for, planned, requested
Time	usually past; future when it is settled	future, or a request right now
Typical frame	又 + verb + 了; 又要 / 又是 …了	再 + verb (+ 一遍 / 一次)
With 要, 想, 能	comes first: 又要, 又想	comes after: 想再, 能再
Usual feeling	often “not again”, sometimes “great, again!”	neutral, practical, polite
Example	他又迟到了！	请再说一遍。

又: it happened again

This is the use every course teaches first. Something happened before, and it has now happened once more. The sentence normally ends in 了, because the speaker is reporting a new situation (see the two uses of 了).

Notice the mood. 又 often carries a little sigh or a little blame, and 怎么又… (how come… again) is a very common way to complain. With 没, as in the last example, the sentence does not need 了.

Because a past repeat is a fact, 再 cannot report it:

又 about tomorrow: when the repeat is already settled

Here is the half of the rule that short summaries usually leave out. 又 can describe a future repeat when the speaker treats it as certain: it is on the calendar, on the timetable, or simply bound to happen. Nobody is deciding anything, so the speaker reports it like a fact.

Look at what follows 又 in each sentence: 是, 要, 该 or 可以 (能 works the same way). These are the words that let 又 point forward, and the 了 at the end says “it's that time again”. The feeling is usually a groan, but the last example shows it can be happy too.

The clearest way to see the difference is to describe the same trip both ways.

再: again, if someone chooses to

再 is the word for a repeat that is not real yet. It appears in requests, suggestions, invitations, plans and offers, which is why it sounds practical and polite.

The last example shows a useful extension: 再 + verb + a quantity means another or more. And the most common 再 of all is in 再见 zàijiàn, literally “see again”: a meeting that has not happened and that you hope will.

If the first attempt is thrown away and you start over, the word is 重新 chóngxīn, afresh: 重新写一遍 means write it again from scratch, while 再写一遍 simply means write it one more time.

Word order: 又 comes before 要 and 想, 再 comes after

When a modal verb such as 要, 想, 能 or 可以 is involved, the two words sit on opposite sides of it.

To remember the order, think of 又 as commenting on the whole situation, so the leaving or the craving is what has come back. 再 belongs to the action you have in mind. What you want is to watch it again, so 再 stays next to 看.

还: the third “again” in questions

When you ask whether something will happen again, Chinese speakers usually reach for 还 hái, the word for still. Asking with 再 is possible, but 还 is the everyday choice.

The last sentence follows the word-order rule from the previous section: 还 goes before the modal 想, and 再 goes after it, next to the verb. Hearing both in one sentence is normal. For the other jobs of 还, see 还是 vs 或者.

再 that means “then”, not “again”

In a sequence, 再 means and only then: the second action waits until the first is done. It still fits the 再 idea, because the second action has not happened yet.

In the last two examples a time comes before 再, and 再 means not until then. 明天再来 is about coming tomorrow rather than today, more than about coming a second time. On its own, 明天再去 usually means go tomorrow instead. To make it clearly go again tomorrow, add 一次 or 一趟, as in the hospital example above. 再说 at the end of a sentence works the same way: it often means we'll deal with it later, a polite way to put something off. 又 can never do this job, because it does not order events.

不再 and 再也不: why 不 and 再 appear together

Three set phrases combine 不 and 再, and each has its own feel.

One related pattern uses the same two characters for something different. 再不…就… means if you don't … now, then …: 你再不走就迟到了 nǐ zài bù zǒu jiù chídào le, if you don't leave now, you'll be late.

又 in an argument: “it's not as if…”

Put 又 in front of 不 or 没 and nothing is being repeated at all. The speaker is pushing back against what the other person seems to assume.

This 又 is common in everyday arguments and can sound sharp, so it is better understood than copied at first. Translated as “again”, these sentences make no sense.

One more 再: “however much”

At HSK 5 you will meet 再…也…, where 再 marks degree rather than repetition: 这本书再贵我也要买 zhè běn shū zài guì wǒ yě yào mǎi, however expensive this book is, I'm buying it.

Frequently asked questions

What is the difference between 再 and 又?

又 is used when the repeat is a fact: it has already happened (他又迟到了) or it is certain to happen (明天又是星期一了). 再 is used when the repeat has not happened yet and depends on someone's wish, plan or request (请再说一遍).

Can 又 be used for the future?

Yes, when the repeat is already settled, as with a date, a schedule or an obligation: 今晚又要加班了, I have to work overtime again tonight. It usually comes with 是, 要, 该, 可以 or 能 and a 了 at the end of the sentence.

Where does 再 go with 想, 要 or 能?

After them: 我想再看一遍, 你能再说一次吗？ 又 goes before them: 他又要走了, 我又想吃火锅了.

What is the difference between 不再 and 再也不?

不再 means no longer and sounds calm and factual: 他不再抽烟了. 再也不 means never again and carries a decision or a strong feeling: 我再也不去那家店了. For the past, use 再也没, often with 过 after the verb: 他再也没回来过, or simply 他再也没回来.

Why does 再见 use 再 and not 又?

再见 literally means see again. The next meeting has not happened and is something you hope for, which is exactly the job of 再.

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