Present Perfect Tense - Active + Passive

Tom has seen this film before.

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Nina has read the newspaper already.

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They have seen these movies yet.

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I have signed the contract.

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These men have bought the tickets.

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Vicky has found her hat.

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I have done my exercise for three days.

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Tom and Jenny have bought this teddy bear in that shop

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These newspapers have been bought by Nina.

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Computer science has been studied by my brother since June.

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