Question

they went home when they had spent all their money

they went home when they had spent all their money,为什么这里用when不用after呢？不是had done sth...when的吗

Answer 1

when表示同时发生，或有先后。
所有有时“when”可以换成“after”或"before"

是的，一般结构是：had done sth... when...did
但when的结构是灵活的，既可以将had done作为主句，
可也以将did作为主句。所以：
had done sth...when...did = did ... when had done sth...

e.g. They went home when they had spent all their money
=They had spent all their money when they went home.

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追问

就是说这里可以用when 也可以用 after before是吗

追答

直接可以换成"after"，
They went home after they had spent all their money.
或倒过来可以用"before"
Before they went home, they had spent all their money.

Answer 2

They went home when they had spent all their money,为什么这里用when不用after呢？
我觉得：They went home when they had spent all their money,=They went home after they had spent all their money,
因为had spent的时态就比went先，你说是吗？

Answer 3

这里是由 when引导的一个状语从句，当然不能用after了

Answer 4

他们花完了所有的钱之后回家了