21.It's bad/good for 对...有害处

　　eating more fruit is good for health.

　　Don't read in bed. It's bad for your eyes.

　　22.It's important/impossible/impolite/difficult for sb. to do sth.对于某人来说做...很重要的

　　At school, it's very important for every student to keep their own classrooms clean and tidy.

　　Although it is raining heavily, it looks that it's impossible for him not to finish the last 200 meters.

　　23. It's time for .../to do sth. 对于...来说做...的时间了

　　It's time for us to borrow books from the library.

　　It's time for Tom to take medicine.

　　24. It's two meters(years) long(old)它两米长(两岁大)

　　He is two meters tall.

　　The river is twenty meters wide.

　　25. keep sb. doing sth 让某人一直做某事

　　The headmaster kept me waiting for two hours last time.

　　Why do you keep laughing all the time?

　　26. keep/make sth. +adj. 让...一直保持...

　　It's important for us to keep calm in danger.

　　The movie was so sad that it made us cry.

　　27. like to do /like doing 喜欢做....

　　My younger sister likes singing and dancing very much.

　　What kind of books does she like reading in her free time?

　　28. make/let sb.(not)do sth. 让某人做/不做某事

　　Make him not lend the book to my younger brother, he will break it.

　　To learn English well, the teacher always makes us read aloud in the morning.

　　29. neither...nor 既不...也不

　　We should come to the party just ath the right time, neither too early nor too late.

　　It's neither too cold, nor too hot here all the year round.

　　30. not... at all 根本不

　　Although life is difficult, each of us doesn't want to give up our hope at all.

　　Some have several girlfriends and others have none at all!

　　31. not only... but also... 不仅...而且

　　Mike not only finished doing his homework but also helped his sister with her English.

　　Today some newly-produced mobile phones can be used not only for taking photos but also for downloading songs from the Internet.

　　32. not... until 直到...才

　　He didin't stop to have a rest until he finished cleaning the old man's room.

　　I didn't understand my mother's love to me until I talked with her yesterday.

　　33. one ...the other/ some ...others 一个…另一个;一些…另一些

　　These are my two favotite books. One is called The Monky King, the other is called Harry Potter.

　　Somepople say the Indian films are booring, but others say they are great.

　　34. see/hear sb do(doing)sth 看见某人做了/正在做

　　I heard my parents quarreling after supper.

　　I heard someone singing in the next room.

　　I heard somone knock a the door when I was cooking.

　　35. so... that 如此…以至于

　　The noise outside was so big that we couldn't hear waht the teacher said.

　　Kate was so angry that she couldn't say a word.

　　36.spend...on(in doing)sth 在…方面花费

　　He spent so much time (in) playing computer games that he was not interested in his lessons.

　　She spends $100 on clothes every week.

　　37. stop/prevent sb. from doing sth. 阻止某人做某事

　　Nothing can stop me from going swimming this afternoon.

　　For years, Mike has kept studying how to stop middle school students from losing themselves in net games.

　　38. stop to do /doing停下来去做某事

　　The boss kept the workers working all the time until they finished all the work.

　　Tell him not to stop to rest; it's important moment now.

　　39. take /bring sth with sb. 随身携带

　　Get the luch which you take with yourself ready, it's time for a meal.

　　My friend brought many chocolates with him to visit me.

　　40.There is something wrong with... 出了问题/毛病

　　There si something wrong with my TV, so we can't watch the match.

　　There's something wrong with my computer. Can you help me?

　　41. too...to 太…以至于不能…

　　Hearing the news of successful launch of Shenzhou-7, many people were too excited to sleep the whole night.

　　The box is too heavy for me to move.

　　42. used to 过去常常

　　She used to spend a lot of time playing computer games.

　　Ther used to be a hospital.

　　43. What about.../How about...? …怎么样呢?

　　How about going out for a walk after supper?

　　I 'm too busy to go tho the movies with you today.How about tomorrow?