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they went home when they had spent all their money,为什么这里用whe

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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
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.
如果有疑问,欢迎追问,
如果有,请记得及时采纳哦,亲…….
再问: 就是说这里可以用when 也可以用 after before是吗
再答: 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.