一般来说是固定或短语,下面这些可能对你有用
like to do sth 喜欢做某事（有时 want to do sth 想要做某事
want sb to do sth 想要某人做某事
turn to sb for help 求助于某人(这算不定式?)
help sb (to) do sth 帮助某人做某事
It is dangerous to do sth 做……是危险的
want to be 希望从事什么职业
stop to do sth 停下来去做某事
remember to do sth 记得去做某事
forget to do sth 忘记去做某事 love to do sth 喜爱做某事
would like to do sth 想要做某事
would like sb to do sth 想要某人做某事（I would= I'd)
practice doing sth 练习做某事
spend(time/money) in doing sth 花时间或钱做某事
spend补充 spend...on sth 在某物上花多少钱
go to do sth 去做某事
watch sb do sth （省略to） 看见某人做某事（全过程）
It's time to do sth 做……事的时间到了（=It's time for sth)
decide to do sth 决定做某事 agree to do sth 同意做某事
have to do sth 不得不做某事
动名词
like doing sth 喜欢做某事（经常） enjoy doing sth 喜欢做某事
be busy doing sth 忙于做某事（=be busy doing sth)
be doing sth （现在进行时）
thank sb for doing sth 谢某人做了某事 （=thank sb for sth)
remember doing sth 记得做过某事
forget doing sth 忘记去做某事
stop doing sth 停止做某事
huan fun doing sth 做某事有乐趣
do some +V.ing 做某事
What about doing sth 做某事怎么样?（=How about doing sth)
watch sb doing sth 看见某人正在做某事
find sb/sth doing sth 发现某人/物在做某事 （这个有点疑问,参考书上说强调结果,一般不用进行时态?）
discuss doing sth 讨论做某事
go doing 去做某事
What do you think of doing sth 你认为做某事怎么样?
原形 let sb do sth 让某人做某事
make sb do sth 让某人做某事
help sb (to) do sth 帮助某人做某事
