grammar → 又
TSUMUGU · TBCL 2 (est.) · 語法
又 grammar point · tier 1 · 又₂ and then also (a second completed action)
· yòu
Adds a second finished action onto a first by the same subject: did one thing, then did another too.

Hook inherited from 又.

Adds a second finished action onto a first by the same subject
框 · Frame
[subj] [verb₁ 了 obj₁]，又 [verb₂ 了 obj₂]
觸 · Trigger
You finished one action and want to add a second one the same subject also did.
序 · The move
1State the first action as completed (verb + 了).Is the first action already finished, not still going?
2Put 又 before the second verb, not at the end.Does 又 sit in front of the verb it adds, never sentence-final?
3Mark the second action completed too (verb + 了).Same subject, and both actions already done?
例 · Examples
1他he買了bought (買 buy + 了 completed)一件衣服one (measure 件) shirt，又and then also (a further completed action)買了一條褲子one (measure 條) pair of trousers。
He bought a shirt, and bought a pair of trousers too.
界 · Boundary
再
又 adds a second action already finished (looking back at done events); 再 sets up an action still to come (do it one more time later).
也
又 chains a further action the subject went on to do (and then also did this); 也 echoes a prior predicate as matching (this one holds the same way).
又…又…
又₂ runs once, joining two finished actions in sequence; paired 又…又… stacks two fixed qualities held at the same time.
再 for a finished action: 他買了衣服，再買了褲子 → 他買了衣服，又買了褲子 (use 又 for events already done; 再 is for the future).
又 at the end: 他買了衣服，買了褲子又 → 他買了衣服，又買了褲子 (又 stands before the verb it adds).
dropping the second 了: 他去了臺中，又去高雄 → 他去了臺中，又去了高雄 (each completed action keeps its 了).
English 'also/too' floats to the sentence end or to the subject; 又 sits before the second verb, and the action it adds must already be completed, not planned.
關 · Related
又…又…the paired sibling of the same graph; stacks two co-present qualities, where 又₂ chains two finished actions也the nearest 'also'; echoes a prior predicate as matching, where 又₂ adds a further action the subject went on to do了1the completion mark each clause carries; 又₂ chains two of these completed actions