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For example I ordered my student to complete their homework before their parents come to the home. In this case Would it be correct if I say sentence below by using past perfect tense?

Had already completed your homework when your parents come to home.

I think it is not correct but I couldn’t find better way than this.

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Imperative in a past tense doesn't make sense.

It is probably grammatical, but very unusual, to use a present perfect imperative:

Have completed your homework when your parents come home.

More common would be

Have your homework completed when your parents come home

(this is not a perfect: it is substanive "have", with adjectival "completed".

but much more common than that would be either

Do you homework before your parents come home

or

Get your homework done before your parents come home.

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