天气很冷,我想我得买把伞,因为看来要下雨了。

It's cold and I think I will have to buy an umbrella because it looks as if it'll rain.

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It's cold and I think I will have to buy an umbrella because it looks as if it'll rain.

it 在这里是代词,指代前面提到的"天气"情况。 looks 是动词 look 的第三人称单数形式,意思是"看起来"。 as 在这里是连词,表示"像...一样"。 if 是连词,表示"如果",在这里与 as 搭配使用。 as if 是一个固定搭配,意思是"好像、似乎",用来表示推测或假设的情况。

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