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问几个英语问题~1.平时经常见到用to加动词来表达单个动词的意思,如to want,to feel,to know等,为

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问几个英语问题~
1.平时经常见到用to加动词来表达单个动词的意思,如to want,to feel,to know等,为什么前面要加to?
2.在这个句子里What has he got in his bag?,能否改成What has he in his bag?为什么?
3.a.When we were having lunch,my mother told us a story.
b.As we were watching TV,the postman arrived.
以上两个从句,为什么一个用when作连词,而另外那个用as作连接词?可否互换?
初学英语,请大大们指教,
1.这是动词的非谓语形式,说简单点,加了to可以作主语、宾语等,什么都行,就是不能做谓语
2.What has he got in his bag?=What does he have in his bag?而What has he in his bag?省去了got,这是英式英语,有点口语化,很久都没用了.在90年代,这种说法是对的,但现在的大纲就把这个定为错的.你记住has在这里是助动词,后面必需加过去分词got,若直接用have,就要用助动词do+实意动词have的形式
3.可以的.as更形象些,自己在做书面表达时就应多用as,这样你的文章会更有亮色些.等你读高中了,你还会学到as在句首引导定语从句,当然这里是表伴随状态.
我是英语高手,以后有什么不懂,问我就是了.