1.Taking exercise is good for us.和To take exercise is good f

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1.Taking exercise is good for us.和To take exercise is good for us.那个说法成立?如果都成立的话,两个句子可以做同义句吗?
2.give up 里的up是介词还是副词还是什么?还有look after、look up、look at里的after up at分别是什么词性?
3.give him up能成立,那么look after him 还是look him after?
4.My job is to teach.中的主语是什么?句中的My的句子成分是?
5.here comes a girl.中的主语是?

1、一般来说,动名词作主语表示一种抽象的和泛指的动作,而不定式作主语则表示一次性的、具体的动作.换句话说,动名词作主语通常不与特定的动作执行者联系在一起,而不定式作主语往往与特定的动作执行者联系在一起.
例如
To live in Beijing is the height of Tom’s ambition.（对某个特定的动作执行者而言）
Swimming is good exercise.（指游泳这项运动）
所以,在这个句子中,taking exercise是一个泛指的经常性的活动,所以,在这里,用动名词作主语更恰当一些.
2.give up里的up是副词,look after中的after,look up中的up,和look at 中的at 都是介词.
这里有一个很简单的判定方式,give是及物动词,后面可以直接加宾语,所以它组成的词组give up中的up是副词,而look是一个不及物动词,后面不可以直接加宾语,所以,由look组成的词组中,一般都是介词,因为只有介词后面才可以加宾语.
3,如果动词词组中的是副词,则it放在中间,而如果是介词的话,则必须放在后面.
所以,give it up成立（这里up是副词）,而必须说look after him（因为这里的after是介词）,同理,也应该说成是look up it 和look at it .
4、主语是my job,句子里的my是做job的定语,表示我的工作.is是系动词做谓语,to teach是不定式做表语.
5.主语是a girl.正常的语序是a girl comes here,因为将here提到了句首,所以,这里用了全部倒装,即把谓语提前到主语之前,所以就成了here comes a girl.

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