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1、Unit 4,Do it yourself,Revision,paper roses,What is DIY? It stands for “do-it-yourself“.,glue,paper,rope,scissors,brush,tape,instruction had better tool brush glue rope scissors,n. 指示 (=d better) 最好 n. 工具 n. 刷子；画笔 n. 胶水 n. 绳索 n. 复剪刀,Words & phrase review,tape DIY exactly stand for repair decorate ins
2、tead of rose,n. 磁带；胶带 n. 自己动手做 adv. 确切地，精确地 代表；象征 vt. 修补 vt. 装饰 而不是，代替 n. 玫瑰（花）,Words & phrases review,crazy be crazy about terrible once put in mistake make a mistake,adj. 着迷的，狂热的； 发疯的 对着迷 adj. 可怕的 adv. 曾经，一度 安装 n. 错误，失误 犯错误,Words & phrases review,power cut pipe fill fill with not only but (also) c
3、eiling,n. 供电中断；停电 n. 管子，水管 vt. 使充满 用填充 不仅而且； 和.都 n. 天花板,Words & phrases review,shelf have fun doing advise course already instead attend,n. (pl. shelves) (橱柜或书 架等的)架子，搁板 做某事很开心 vt. & vi. 建议，忠告，劝告 n. 课程；过程 adv. 已经 adv. 反而；却 vt. & vi. 经常去；出席,Words,Words & phrases review,Youd better (not) do sth. 表示“你最
4、好（不要）做某事”。 It is pretty cold. Youd better put on my coat. 挺冷的，你最好穿上你的外套。 Youd better not play with the dog. 你最好不要和狗玩。,1. Youd better get some tools.,Youd better _ there. Its dangerous. A. not go B. not to go C. not go to D. not to Would you mind if I open the window? _, I got a cold. A. Youd better
5、not. B. Never mind. C. Of course not. D. All right.,Reflection,2. try to do 努力去做某事，尽力干 try doing 尝试着干某事，试着（用什 么方法）去做某事 3. fill with 用填充 4. instead of doing 代替做某事 5. not only but (also) 不仅而且 6. advise sb. to do sth. 建议某人做某事 7. have fun doing sth做某事很开心 Eg: We always have fun_(chat) with each other.,Gr
6、ammar,Imperative sentence,祈使句的结构如下： (Please) + do sth. (Please) + Dont do sth.,肯定：,否定：,祈使句 : 是表示请求、命令、建议等句子，通常说话的对象是第二人称you, you常被省略, 谓语动词用原形，句末则使用感叹号或句号,读降调。,祈使句,祈使句,无主语,只用动词就可以. 表示请求或命令,加上please表客气。 如果变成否定句， Dont开头是规律。 No talking!是警示，祈使句用法要牢记。,练习巩固,一、单项选择。 1.Please _, they are having a meeting. A.
7、 not be so noisy B. be quiet C. mustnt talk D. no speaking 2. to meet me at the station. Ill be waiting there. A. Not to forget B. Not forget C. Forget not D. Dont forget,Exercises:,1. Jim, _ me a hand. A. gives B. is giving C. will give D. give 2. _ careful, Jenny! There is a tree in front of you.
8、A. Am B. / C. Be D. Was 3. Lets _ our time. A. not waste B. no wasting C. not to waste D. no waste 4. Jim, _ read books while you are walking in the street. Its very dangerous. A. dont B. doesnt C. wont D. cant,Exercises:,should & had better,当我们给他人提建议时，可以用had better和should，表示“最好”或“应该”做某事， had better
9、的语气比should强一些。 had better (常简略为d better)，是一固定词组，后面必须跟动词原形，没有人称和数的变化。构成：had better do sth. 句型。 had better 的否定式是将not直接放在had better的后面。,should 后面也要跟动词原形，且没有人称和数的变化。 should 的否定式是should not/shouldnt。 Eg: You shouldnt drink and drive. 你不应该喝酒后开车。,You should stop smoking. 你应该戒烟。,Youd better go to hospital a
10、t once. 你最好立即去医院看病。 Tom, youd better go there today. 汤姆，你最好今天去那儿。 You had better not miss the last bus. 你最好不要错过末班公共汽车。,1. Please know a little about DIY.,You should know a little about DIY.,We use should and had better when giving advice and telling people what is the best or right thing to do.,You
11、had better know a little about DIY.,3. Dont hit the pipe.,You should not/ shouldnt hit the pipe.,You had better not hit the pipe.,I. 单项选择。,1. The TV is too loud. Please _. A. turn it down B. to turn it down C. turn down it D. to turn down it 2. _ late again, Bill! A. Dont to be B. Dont be C. Not be
12、D. Be not,3. _ cross the road until the traffic lights turn green. A. Not B. Wont C. Doesnt D. Dont 4. _ me the truth, or Ill be angry. A. Telling B. To tell C. Told D. Tell,III. 完成句子。,1. 你应该在南京换火车。 _ change trains at Nanjing. 2. 你最好在下雨前回家。 _ before the rain starts. 3. 现在你最好别打棒球了。 _ baseball now. 4.
13、 We mustnt spend too much time on TV.（改为祈使句） too much time on TV.,You should,Youd better go home,You had better not play,Dont spend,Happ y,unhappy,not happy,Pre-study,polite,impolite,not polite,expensive,inexpensive,not expensive,unhappy,impolite,inexpensive,un-,im-,in-,prefix (前缀),Work out the rule
14、!,Work out the rule!,Tip:,dis- il - ir-,较常用的前缀 e.g. dishonest 常用在以 “l”开头的词前e.g. illegal 常用在以 “r”开头的词前 e.g. irregular,1._ 是最常用的否定前缀 2.否定前缀_常用在以字母“c”开头的单词前， 3.否定前缀_常用在以字母“p 开头的单词前。,“un-”,“in-”,“im-”,从来都不会用在以字母l,r开头的单词前。,/b/m,friendly happy comfortable safe healthy ,unhealthy,“un-”,kind lucky pleasant
15、important tidy usual,untidy,unfriendly,unhappy,uncomfortable,unsafe,unkind,unlucky,unpleasant,unimportant,unusual,expensive correct complete direct,inexpensive,incorrect,“in-”,possible patient proper,impolite,“im-”,incomplete,indirect,polite ,impossible,impatient,improper,1._friendly 2._happy 3._correc
