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问题: 请教几个英语语法问题

1、how about&what about有什么区别?
2、what about sitting by the window?为什么sitting后面要接个by,而不是直接接the window?
3、He thinks too much himself.much后面为什么不加个by?
4.You most not think about it any more.think about 为什么不用thinking about?
5、You must be think about your child这里为什么要用think abou 而不用thinking about?

解答:

1.它们两个表达都是询问别人意见,意思上一样的。
what about 主要+ sth/sb。
How about 主要+ doing?
eg:What about this one>?
How about going for a walk?
2.因为sit 是个不及物动词,后面不能跟宾语。这里的by是介词,意思是靠窗而坐。
3。by oneself 意思是某人亲自做事。Daming does his homework by himself.就是说他自己做的家庭作业。(而不是别人帮做)。你的这个句子himself是反身代词做宾语(和主语是同一人)的用法。
4。应该不是most而是 must 吧?must是情态动词,+ 动词原形,后面只能用sit原形。
5。应该是用thinking的,有be 动词在。