又 is used in declarative sentences and describes the simple repetition of actions. This repeated action has already occurred once in the past.
S + 又 + Verb + 了
The TV is acting up again.
They're digging up the road again.
又 is sometimes used to express that something that has happened before is going to happen in the immediate future. In this case, it usually appears with 要、可以、能、是。
S + 又 + 助动词/谓语动词 + Object
It promised to be another cold day.
I guess you'll be late again as usual.
再 is used to express something that has already happened and will happen again.
S+ 再 + Verb
They took the garbage out again.
Let's carry on this discussion tomorrow. 4
再 can also be used to express the equivalent of the English word 'another".
S + 再 + Verb + Object
Can I have another apple?
再过几天 can be used with 先 to express sequential order.
S + (行) + Action 1 + 再 + Action 2 i
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