一、重点句子

1. It's silly of you not to forgive others for their mistakes. （你不原谅别人的错误是愚蠢的。）
2. Sandy has been on the phone for half an hour. （Sandy已经打了半个小时的电话了。）
3. A year is divided into (被分成)12 different star signs.
4. He's Gemini = His star sign is Gemini. （他是双子座。）
5. The only difference is that David has much more hair than my uncle.
6. We think that David has all the qualities to be a good chairperson. （我们认为David具备了当一名好的学生会主席的所有品质。）
7. It is thoughtful of Andy to play his CDs for us. （Andy为我们播放CD，他考虑得真周到。）
8. It is typical of Simon to make such a mess. （把事情搞得乱七八糟是Simon的典型特征。）
9. He will / would not mind doing extra work for the Students’ Union.（他不介意为学生会做额外的工作。）
10. He always gets good marks in tests. （他在测试中成绩一直名列前茅。）
11. He never forgets to do the things he needs to do. （他从不忘记去做他需要做的事。）
12. He has joined the Computer Club this year because he wants to learn to use the computer to help himself get more organized.（help himself get more organized 帮助自己工作起来更有效率）
13. We hope that you agree with us.
14. ---It was kind of you to recommend me as the new chairperson.
= Thank you for recommending me as the new chairperson. （谢谢你们推荐我当新任主席）
15. Mr Wu spends a lot of time explaining things to us. （explain sth. to sb. 向某人解释某事）
16. Daniel is very clever, but he never shows off.（show off 买弄，炫耀）

二、语法

1.It's + adj + of sb + (not) to do 
(of 后面的名词或代词与前面的形容词有逻辑上的主表关系. 形容词有kind, clever, foolish, selfish, polite, right, wrong, careful, generous, thoughtful, silly 等表示人的品质或性格)
e.g. It's kind of you to lend me so much money. = You are kind to lend me so much money.
2.It's + adj + for sb + to do  (for后面的名词或代词与前面的形容词没有逻辑上的主表关系.形容词有easy , hard, difficult, possible, necessary, important, heavy 等表示不定式特征)
e.g. It’s impolite for students not to hand in their homework on time. 
3. be + adj /adv + enough + to do  (某人或某物)足够/能够……
e.g. The work is not easy enough for us to finish in a week.
 = The work is so difficult that we can't finish it in a week.