It’s no good/use… -ing and It is worth …-ing.常用-ing, 其他时候为非正规表达。
1) It’s no good talking to him – he never listens.
2) It’s no use expecting her to say thank-you.
3) It’s no use trying to explain – I’m not interested.
4) It’s worth going to Wales if you have time.
5) It isn’t worth waiting for him.
6) Is it worth visiting Wales?
7) It isn’t worth repairing the car.
8) It’s not worth getting angry with her.
9) It was nice seeing you. （其实是分手时说的话）
10) It’s interesting planning a holiday. （表示习惯）
11) It’ll be enjoyable studying and working. （习惯）
12) It’s nice being with you / talking to you, Erin. （其实是分手时说的话）
比较用不定式和动名词做主语的区别：
1) It’s no use crying over spilt milk. (格言)
2) His mother had advised him, however, that is was no use to argue with Selma. (具体动作)
3) He realized that to go on like this was no use. (具体动作)
1) Reading without through comprehension is no good. （习惯）
2) It’s quite necessary to read it many times. （具体动作）
1) Living in the west has its advantages. （习惯）
2) To live in the west was the height of Mrs. Jameson’s ambition. （具体动作）
但是，二者其实没有明确区分：
1) It’s no use arguing with Selma. (用to argue 也可)
2) Seeing him happy made me happy too.（习惯）
3) It’s great fun preparing for Pamela and Peter’s visit.（习惯）
(用不定式一般是安全的)