could可代替can表示现在时间的动作，但语气较为婉转。例如： Could I speak to John，please？我能和约翰说话吗？ Could you？在口语中表示请求对方做事。例如： Could you wait half an hour？请你等半个小时好吗？
Could you please ring again at six？六点钟请你再打电话好吗？
(4) can的形式
只有现在式can和过去式could两种形式。能表示一般现在和一般过去两种时态，有时也能表示将来。所有其他时态（包括将来时）须用be able to加动词不定式来表示。例如： They have not been able to come to Beijing. 他们没有能到北京来。 11. look for/ find
look for 意为“寻找”，而find意为“找到，发现”，前者强调“找”这一动作，并不注重“找”的结果，而后者则强调“找”的结果。例如：
She can?t find her ruler. 她找不到她的尺子啦。
Tom is looking for his watch，but he can?t find it.汤姆正在寻找他的手表，但没能找到。 12. be sleeping/ be asleep
be sleeping 表示动作，意思是“正在睡觉”；be asleep 表示状态，意思是“睡着了”。如： ---What are the children doing in the room? 孩子们在房间里做什么？ ---They are sleeping.他们正在睡觉。
The children are asleep now.现在孩子们睡着了。 13. often/ usually/sometimes
often表示\经常\，sometimes表示\有时候\，在表示发生频率上often要高于usually，usually要高于sometimes。这三个词表示的是经常性，一般性的动作或情况，常与一般现在时连用，常位于主要谓语动词
的前面，其他谓语动词（be动词，情态动词和助动词）的后面，有时也可位于句尾。如果要加强语气，则放在句首。
We usually play basketball after school.我们通常放学后打篮球。 Sometimes I go to bed early.有时，我睡觉很早。
He often reads English in the morning.他经常在早晨读英语。 14. How much/ How many
how much常用来询问某一商品的价格，常见句式是How much is / are…? How much is the skirt? 这条裙子多少钱？ How much are the bananas? 这些香蕉多少钱？
how much后加不可数名词，表示数量，意为“多少“，how many后加可数名词的复数形式。 How much meat do you want? 你要多少肉呀？
How many students are there in your class? 你们班有多少人？ 15. be good for/ be good to/ be good at
be good for 表示\对……有好处\，而be bad for表示\对……有害\；be good to表示\对……友好\，而be bad to表示\对……不好\；be good at表示\擅长，在……方面做得好\，而be bad at表示\在……方面做得不好\。
Doing eye exercises is good for your eyes.做眼保健操对你的眼睛有好处。 Eating too much is bad for you health.吃的太多对你的身体有害。 Miss Li is good to all of us.李老师对我们所有的人都很友好。 The boss is bad to his workers.这个老板对他的工人不好。
Li Lei is good at drawing, but I'm bad at it.李雷擅长画画，但是我不擅长。 16. each/ every
each 和every都有\每一个\的意思，但含义和用法不相同。each从个体着眼，every从整体着眼。each 可
用于两者或两者以上，every只用于三者或三者以上。 We each have a new book. 我们每人各有一本新书。
There are trees on each side of the street. 街的两旁有树。
He gets up early every morning. 每天早晨他都起得早。
each可以用作形容词、副词和代词；every只能用作形容词。 Each of them has his own duty. 他们各人有各人的义务。
They each want to do something different. 他们每个人都想做不同的事情。 17. 一般现在时/现在进行时
一般现在时表示经常性的或习惯性的动作或存在的状态，也表示说话者的能力，还有自然现象；而现在进行时表示正在进行或发生的动作（构成方式为am/is /are/+doing）。 I do my homework in the evening. 我在晚上做作业。
I'm doing my homework now. 我现在正在做作业。
现在进行时常与now, these days, at the moment 或Look, listen等词连用；而一般现在时常与often, always, sometimes, usually, every day, in the morning, on Mondays等连用。 We often clean the classroom after school. 我们经常放学后打扫教室。
Look! They are cleaning the classroom . 看！他们正在打扫教室呢。 【考点扫描】
中考考点在本单元主要集中在：
1．动词一般现在时和现在进行时的用法，人称代词的用法，可数名词和不可数 名词的构成和用法。 2．本册书中常见的交际用语 3．本册书中一些重点的词组和短语
考试形式往往是单项填空、完形填空、短文改错和短文填空。 【满分演练】 一. 单项选择
1. There is some ______ on the plate. A. cakes B. meat C. potato D. pears
2. Uncle Wang wants ______ the machine like a bike. A. ride B. riding C. rides D. to ride
3. Tom usually goes to bed ________ ten o'clock in the evening. A. at B. in C. on D. of
4. ______ picture books in class, please.
A. Not read B. No read C. Not reading D. Don't read 5. The box is too heavy. Let ________ help you to carry it. A. we B. us C. ours D. our
6. Hurry up, ______ we'll be late for the meeting. A. and B. but C. then D. or
7. People usually ______ \ A. say B. speak C. tell D. talk 8. Look! She ________ a kite for her son. A. makes B. is making C. make D. making 9. These shoes are yours. Please ________.
A. put on them B. put on it C. put them on D. put it on 10. She often gets ______ very late.
A. home B. at home C. to home D. in home 11. I think the shop is closed ________ this time of day. A. in B. on C. at D. for 12. I want ______ of meat, please.
A. half kilo B. a half kilo C. half a kilo D. a kilo half 13. --- Is this black ruler ________? --- No. It's ________.
A. yours, his B. your, his C. yours, him D. you, he 14. ________ book on the desk is a useful（重要的）one. A. A B. An C. The D. /
15. Grandma is ill. We have to take her to the ________. A. farm B. post office C. hotel D. hospital
16. Liu Mei often helps her mother ________ housework. A. does B. do C.doing D. to doing
17. We watch evening news on ________ at 7:00 in the evening. A. CCTV B. CAAC C. WTO D. MTV