do you know how後面加什麼

拓展：Do you know how to do it?

(用how時加賓語it)和Do you know what to do?(用what時不加賓語)因為what本身是代詞,就可以直接做do的賓語,而how是副詞,不能做賓語；且do做及物動詞,所以後面要補充出其賓語。