to do是非謂語動詞,就是不能直接作謂語的。
to do一般是和其他動詞一起搭配成詞組,如 want to do sth 想要做某事。
例句：
I have got piles of work to do.
我有大量工作要做。
Could you teach me to do that?
你能教我干那活兒嗎？