Most scientists now think that the moon was once part of Earth.为什么这里的part前面没有加a?trains travelling to different parts of a city mean fewer cars and buses on our roads.为什么mean不加s?不是应该动名词做主语用三单

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Most scientists now think that the moon was once part of Earth.为什么这里的part前面没有加a?trains travelling to different parts of a city mean fewer cars and buses on our roads.为什么mean不加s?不是应该动名词做主语用三单
Most scientists now think that the moon was once part of Earth.
为什么这里的part前面没有加a?
trains travelling to different parts of a city mean fewer cars and buses on our roads.
为什么mean不加s?不是应该动名词做主语用三单一的么?
解释下、谢、

Most scientists now think that the moon was once part of Earth.为什么这里的part前面没有加a?trains travelling to different parts of a city mean fewer cars and buses on our roads.为什么mean不加s?不是应该动名词做主语用三单
朋友,
本人以为,第一个问题,a part of的意思是一部分,而part of sth的意思虽然也是一部分,但是,它表示的是整体的一部分,联系密切,是母与子的关系.而a part of是指混在一起的事物中的一部分,联系并不是很强哈.
第二个问题,注意主谓一致就可以解决了哦.首先,主语是different parts,是复数,然后看谓语,用的是mean,是正确的,所以,做题时要找准主语是什么哦.

我也不是特别清楚,呵呵,建议你查查牛津词典 查 mean的用法

我试下奥.不一定对
1).因为有once
2).因为是trainS

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