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when加过去式 的用法 比如 sb did sth等等

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when加过去式 的用法 比如 sb did sth等等
I didn't konw when he would leave.
I didn't konw where he would go.
I didn't konw what he would do. (would 是will的过去式)
看出了吗?when 和 后面的内容只有 逻辑上的关联.
when加过去式 的用法 比如 sb did sth:即是 when+句子,句子是过去式只是表明发生在过去的事情.
when+句子:是一个名词性结构,具有名词的作用,可以作主语,宾语,表语,同位语.
I didn't konw when he would leave.(作宾语从句)
where he would go was what she cared.(主语从句)
what she cared was where he would go (表语从句)