adverb, verb, pronoun, noun · (once) again; indicating the repetition of an action (usually in the past)

他今天又迟到了。

adverb · used for emphasis, often to provide an additional reason or in a rhetorical question

我又不是故意的，你干嘛生气？

conjunction, adverb, expression · used to connect two words or phrases to show coexistence or simultaneous qualities

这个苹果又大又红。

adverb, punctuation · but; expressing a contrast, contradiction, or unexpected result

我想去，又怕没时间。