past/past perfect

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fatfat116

Senior Member
Chinese
Hello, I saw some grammar books about the past and past perfect tenses.

some books say that we need to use the past perfect tense when we talk about two past actions

but some books say if the two past actions is linked up with a word like 'before, after, we do not need to use the past perfect since this words imply a time sequence.

So, would anyone tell me which is correct and which is more natural?
An example:
He had left home before you left
He left home before you left

Thank you
 
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