Can we use specific time when using past simple with past perfect?

Question

I wonder if it's possible and correct to put a specific time like this.

I had finished my homework at 6 am. before I went to school at 7 am.

fev · Answer

This sentence doesn't sound idiomatic. If you are so keen on expressing the times of your actions, you could say:

I finished my homework at 6 am AND I went to school at 7 am.

as 6 am is obviously before 7 am.
If you want to concentrate on before then maybe 7am can be omitted:

I had finished my homework at 6 am., before I went to school.

You could also omit 6am, depending on what you want to stress:

I had finished my homework before I went to school at 7 am.

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