Nobody --------[know] how to do it?wei shen me?

Nobody --------[know] how to do it?wei shen me?
Nobody --------[know] how to do it?
wei shen me?

Nobody --------[know] how to do it?wei shen me?
看作单数所以
nobody knows how to do it

knows. 不定代词做主语，谓语用单数。

I know.

用Knows. Nobody作主语，谓语用单数。