YOU SAID:

would've, could've, should've

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だと思います、したことがあるはず

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And that, I think that there should be

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、私はする必要がありますと思うと

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And I think I must be

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私は私がする必要がありますと思う

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I think I should I be

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私は私がする必要がありますと思う

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I think I should I be