I don't konw what to do.=I don't konw how to do it .为什么what不能加it 呢

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I don't konw what to do.=I don't konw how to do it .为什么what不能加it 呢

I don't konw what to do.=I don't konw how to do it .为什么what不能加it 呢
I don't konw what to do.=I don't konw how to do it .为什么what不能加it 呢

I don't konw what to do.=I don't konw how to do it .为什么what不能加it 呢
因为what 相当于名词,相当于 do what所以不用it了.
how 只是 副词,如果要两边意思相等就要do 后面要加个名词 it 相当于事物

因为what为 do的逻辑宾语,加他词则多余;how为副词,不能做宾语,故加It。

what是do的宾语,how是状语。

因为what是do的宾语,再加it就重复了。