look forward to doing,payitforward

为什么 look forward to 后面一定要接 doing,其中的
介词的to (后接动词ing) devote to look forward to doing stick to
look forward to doing sth 是期望干某事的意思,这里的"t
后接动词ing) 介词的 (后接动词 devote to look forward to doing
sb doing造句 have a look rainy days make me sad look forward to