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
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.