介词加动名词默认主语是一个吗看这句话,新概念的,after taking off.we were flying low
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因为“我们”是坐在飞机上的,所以可以把we看作是taking off的逻辑主语,在时间状语从句里,可以把主语省掉,变成一个短语:"连词 + 非谓语动词(或其它短语)", 整个句子就成了简单句了.

When crossing the road, be careful. = When (you) cross the road. (you should) be careful.

While in Whuan, I was very happy. = While I was in Wuhan, I was very happy.

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