if [ɪf] 如果;假若;倘若;当;

You can go if you want.
你要是想走就可以走。

Don't come if you're busy.
如果你有事的话，就不要来了。

If you see him, give him this book.
你要是见到他，就把这本书给他。

You can stay for the weekend if you like.
你如果愿意就留在这里过周末吧。

Do you mind if I turn the TV off?
我关上电视可以吗？

Do you want that cake? If not, I'll have it.
你要那块蛋糕吗？不然我就要了。

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