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Text from MatiAberaJote - English

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Please,help me
When e how I MUST use present perfect?
And how i can choose when use past perfect and when Simple past?

MatiAberaJoteFebruary 2017Vote now!
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PLEASE, HELP TO CORRECT EACH SENTENCE! - English

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- Please,help me
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Sentence 1
- When e how I MUST use present perfect?
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- ADD a NEW CORRECTION! - Sentence 1
Sentence 2
- And how i can choose when use past perfect and when Simple past?
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- ADD a NEW CORRECTION! - Sentence 2