to后跟doing还是do如何判断?

to是介词时 跟doing,为不定式符号跟do 另外还要记住一些词后的to是必须用do 还是doing 给你列举几个 用doing的 admit to prefer…to be used to lead to devote oneself to object to stick to no good no use be fond of look forward to 这些词用 to do aim agree arrange ask decide bother care choose demand desire determine hope fail help learn long manage offer plan pretend refuse tend undertake expect hate intend ……