11.How/What about doing sth. ? 做某事怎么样？
How about going swimming this afternoon?
12.have to do sth. 不得不做某事
It is too late，I have to go home now.
13.had better （not）do sth. 最好（别）做某事
You’d better go to see her tomorrow.
14.help sb. （to）do sth. 帮助某人做某事
He often helps me （to）learn English.
help sb. with sth. 帮助某人做某事
The girl sometimes helps her mother with the housework.
15. need （to）do sth. 需要做某事
You need （to）earn more money to support your family.
16.hope to do sth. 希望做某事
I hope to see your father soon.
17.forget to do sth. 忘记了要去做某事
The old man often forgets to turn off the light after going to bed.
forget doing sth. 忘记了曾做过的某事
The old man forgot having dinner with me last year.
18.remember to do sth. 记住了要去做某事
Please remember to telephone me when you arrive there.
remember doing sth. 记得曾经做过的事
It is two years since I left you ，but I still remember working happily with our group.
19.stop to do sth. 停止（正在做的事）去做（另一）某事
The boss stopped to talk with me when I entered his office.
stop doing sth. 停止做某事
The students stopped talking when the teacher came in.
20.go on to do sth. 接着去做（另一）某事
The boy went on to read after finishing his homework.
go on doing sth. （=go on with sth.） 接着做原来所做的事
The girl went on doing her homework after a short rest.