I dont know what to do.在这里为什么不能把what改为how

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/17 01:12:53

I dont know what to do.在这里为什么不能把what改为how
这个what to do不是不定时的复合结构吗?用how to do应该也可以啊,可是老师说必须用what,

你好;
I don't know what to do ? 意思是"我不知道做什么"
I don't know how to do it ? 意思是"我不知道怎么做" 这里的 it 不能省略
所以上面的两个句子有很大的差别的

"I"是主语 "don't konw"是动词,这里是谓语后面应是完整的一句话“how to do it"这完整的一句话是整个大句子的宾语,叫做“宾语从句”.
如果少了"it",则是少了从句中的宾语,而不是整个大的句子的宾语.这里的"it"不能省略.

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