1、It is + adj. + for sb. to do sth.

例句：It is important for students to study hard.

2、Doing sth. is + adj.

例句：Doing sports is helpful.

3、Sb. can’t do sth. without+ doing sth.

例句：You can't make progress without making any effort.

4、It is + adj. (for sb.) to do sth.

例句：It is necessary for us to protect the environment.

5、Sb. should+ do sth.

例句：We should take actions to reduce pollution.

6、What's + adj. + about sth.

例句：What's interesting about this book?

7、If+ 主语 + do、did、were to do等，主句

例句：If I were to help him, he would be very grateful.

8、It takes sb. some time to do sth.

例句：It takes me four hours to finish my homework every day.

9、It's +adj. + of sb. to do sth.

例句：It's kind of you to help me with my English.

10、Sb. be +adj. + to do sth.

例句：He is too young to go to school by himself.

11、Sb. would rather do sth. than do sth.

例句：I would rather stay at home and read a book than go out with friends.

12、Sb. can't help + doing sth.

例句：I can't help feeling excited when I think of the coming holiday.

13、Sb. do sth. as soon as/after/while/before/when +clause

例句：I will do my homework as soon as I get home.

14、Sb. can't stand + doing sth.

例句：I can't stand eating the same food every day.

15、It is +adj. + of sb. + to do

例句：It is important of us to protect the environment.