I did some shopping before went home为什么不是I had done some shopping before went home?主句发生的事不是在从句之后,

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I did some shopping before went home为什么不是I had done some shopping before went home?主句发生的事不是在从句之后,

I did some shopping before went home为什么不是I had done some shopping before went home?主句发生的事不是在从句之后,
I did some shopping before went home
为什么不是I had done some shopping before went home?
主句发生的事不是在从句之后,

I did some shopping before went home为什么不是I had done some shopping before went home?主句发生的事不是在从句之后,
句子是不是错了,少写了一个I,应该是:
I did some shopping before I went home.(before后面直接跟动词的话,需要用动词ING形式.)
从语法上来说,I had done some shopping before I went home.没有错误,也可以说,只是这个强调在回家之前就已经逛完街.

Both are OK, but you should add " I " after the word "before".

因为do是一个短暂性动词,不能用于表达过去完成时,你翻翻关于过去完成时的语法,看看。

也可以啊