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1、should用法归纳一、Should 表示义务、责任、常译为“应当”，“应该”，或表示一种估计的情况，译成“按理应当”，“估计.”。Why should I pay him? 为什么我该付给他钱?They should be there by now， I think. 我估计，他们现在到那儿了。二、用于成语中 I should like to.“我想(做).”I should like to ask the teacher a question. 我想问老师一个问题。三、shouldnt ：不应该（表示责备）；应该不，应该没有（表示推测）。如： You shouldnt be so lazy
2、.你不应该这么懒惰。 There shouldnt be any problem with your listening.你的听力应该没有 问题了。用should 或shouldnt 填空。1. All of us _study hard and learn English well.2. As a student, you_ eat in class.3. You _speak to your parents like this ,you must be polite (有礼貌)4. You _eat less and take more exercise if want ot be hea
3、lthier and stronger.5. My mother is very tired after work, I_ do some housework for her.had better(常简略为d better)是一固定词组，had better最好，用于表示对别人的劝告、建议或表示一种愿望。其用法有以下几点：一、had better后面必须跟动词原形。had better后跟动词原形(即不带to的不定式)，构成had better do sth.句型。这里的had不能用have来替换。如：Youd better go to hospital at once.你最好立即去医院看病。
4、Tom, youd better go there today.汤姆，你最好今天去那儿。二、主语不论是第几人称，句子不论是什么时态，都要用had better的形式。如：Now you(he，we) had better listen to the teacher.你(他，我们)现在最好听老师讲。三、had better的否定式。如：常用的否定形式是将否定副词not直接放在had better的后面。如：You had better not miss the last bus.你最好不要错过末班公共汽车。You had better not leave for Nanjing the day
5、after tomorrow.你最好后天不要动身去南京。注意：否定副词not绝不能放在had的后面。如：不能说：You hadnt better go.而应该说：You had better not go.四、在祈使句中，had有时可以省略。如：Better not do it .最好别做那事。Better not wait for them.最好不要等他们。 五、had better在表示对别人劝告、建议时，不宜用于与陌生人、长辈及上级的交谈中。对长辈说话时，最好不用had better。比较有礼貌的说法是：It might be better for you.；It would be better for you.。如：It might be better for you to help me，Grandpa.爷爷，您最好能帮我一下。练习下列各句都有一处错误，请改正。1.Youd better to wait for me at the school gate.2.I have better write to him now.3.You had not better go there. 4
