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...wh...就是说这里可以用when 也可以用 after before是吗直接可以换成"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.
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
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
英语人气：278 ℃时间：2019-11-04 07:29:41
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