hope to do,want to do,learn to do,prefer to do,be ready to do,be about to do,regret to do,forget to do,remember to do,set out to do,try to do,suppose to do等.这是一类.
另一类如ask sb to do,tell sb to do等
其实英语里有很多动词后面都可以加to do,建议你可以慢慢积累起来,把一些to作为介词的整理到一起,后面跟doing的整理到一起,to do 和doing 都可以的就不要特别记忆了.其实大多数读读就出来了.