He'll talk for hours, if you let him.

你要让他讲，他会讲几个小时。

youdao

If you let him stay at your home, you are asking for trouble.

假如你让他待在你家，你就是在自找麻烦。

youdao

If you loved Lycidas so much, how could you let him die?

如果你们真的爱利西达斯，又为何让他死去？

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He envelops you with this huge spirit, if you let him.

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If you called him in advance, he would let you come to the house.

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If you value an employee, let him or her know it.

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