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plYòu 又, zài 再 and hái 还/還these three adverbs share a similar function expressing recurrence and temporal progression in Chinese. While they all overlap in the general sense of ‘again’ or ‘further’, they differ fundamentally in sentence position and how the speaker views the action’s relationship with time and reality. Yòu 又 often means that something happens again as a repeated event (it has already happened or the same situation returns). Zài再 is used for something that occurs again later or one more time (the repetition has not happened yet). Hái 还/還 focuses on the sense of continuity that may come from the action or state itself, or from the speaker’s prospective.
For explanation of the structures, check Adverb yòu 又 “again”, Adverb zài 再 “again”, “some more; another”, Adverb hái 还/還
Differences
1. Position with modal verbs
When there is a modal verb (e.g. néng 能 ‘to can’, yào 要 ‘to want’, huì 会 ‘to be able’) in a sentence, yòu 又 and hái 还/還 are placed before it, while zài 再 follows the modal verb and precedes the main verb.
2. Position with negation adverbs
When there are bù 不 ‘not’ or méi 没/沒 ‘not’ in a sentence, yòu 又 and hái 还/還 are placed before them, while zài 再 usually follows them.
Yòu 又+ méi 没/沒 indicates that something did not happen again in the past or present.
Hái还/還 + méi 没/沒 indicates the continuity of an action or state that has not occurred up to the present.
Méi 没/沒 + zài 再 indicates that the action has not been repeated again after a certain time or a completed action.
Bù 不 + zài 再 indicates that the action or state will be stopped.
3. Expressing recurrence
To indicate that an action or state has been repeated again in the past or present, only yòu 又 ‘(once) again’ can be used. In most sentences with yòu 又, both the original action or state and the recurrence have already occurred, and the particle le 了often appears in the sentence.
For recurrence in the future, zài 再 ‘again’ is used. In this case, yòu 又 is usually not used.
Finally, hái 还/還 can also be used to refer to a future action or state that will happen again. This would happen when the situation is understood as continuing over time. The sense of continuity may come from the action or state itself (for example, ongoing activities, states, or existing arrangements), but it may also come from how the speaker understands and presents the situation. However, if the speaker instead frames the future event as a new next occurrence, zài 再 may be used, and in some contexts the two can become interchangeable depending on this interpretation. Examples are provided as the answers of B1 and B2 below.
4. Expressing addition or accumulation
Zài 再 can be used with verbs and adjectives functioning as predicates to indicate doing something additional, more, or again, but focusing on increasing the quantity of an action or object. It often appears when asking for more of something or another instance of an action. In this case, the use of zài 再 can be similar to the use of ‘another’. Yòu 又 and hái 还/還 cannot be used to convey this meaning.
To express accumulation of actions already occurred, yòu 又 can introduce a second clause that indicate an additional action connected to what has already been mentioned in the first clause. In this case, it is often translated as ‘and also’, and it can be interchanged with hái 还/還, meaning ‘moreover’ in this context. In this case, the use of yòu 又 often shows the speaker’s feeling (sometimes annoyed, sometimes surprised), while the use of hái 还/還 has a more neutral tone. Here, zài 再 cannot be used.
When yòu 又 introduces an additional action that has already occurred and this action is negated by bù 不 ‘not’, the literal meaning is ‘and also not do something’, but it can be translated as ‘not even’. In this case, hái 还/還 cannot be used.
5. Expressing sequential order
Both zài 再 and yòu 又 can indicate a series of actions or states: zài 再 is used for habitual actions or for actions and state that will occur in the future; while yòu 又 is used for actions or state that have already occurred in the past or present.
With this meaning, zài 再 often appears in the pattern xiān…… zài…… 先…… 再…… ‘first… then…’, indicating that one action happens and then another action will happen. It is often used to give instructions in chronological order. In these contexts, yòu 又 and hái 还/還 cannot be used.
Yòu 又 can also mean ‘and then; and also’, it can be used in a second clause to narrate or describe a series of actions or states that have already occurred in the past or present, also in the pattern xiān…… yòu…… 先…… 又…… ‘first… then…’. In this case, zài 再 and hái 还/還 cannot be used: because zài 再cannot be used with actions or states that have already occurred, while hái 还/還 expresses addition rather than the order of actions or states.