情态动词 (2)

1、Can you get me a packet of electricity, please?We use can and cannot (cant)to say we are able or not ableto do things.can=be able to cant= not be able toI can count.You cannot spell.Can they dance?Yes, he can./No, she cant.When we use modal verbs as can and cannot with other verbs, the verbs followi

2、ng the modal verbs do not change their form.can/cant +动原动原 Read what Tom and Ann say about themselves.Then say if the statements below are T (True) or F (False).I can swim, dance, play football and speak two languages. I cant cook, play the guitar or ride a bicycle.I can ski, dance, play chess and s

3、peak three languages. I cant type, paint pictures or drive a car.1Tom can play football. T / F2Ann cannot paint pictures. T / F3Tom can speak more languages than Ann. T / F4Tom and Ann can both dance.T / F5Ann can drive a car, but she cannot play chess. T / F6Tom can swim, but he cannot play the gui

4、tar. T / F7Ann can ski and type.T / Fthe past form for can/cantcould / couldnteg. I could speak a little Japanese.You must always be careful with electricity.We use must and must not (mustnt) to tell people whatdo to or what not to do.must 表示必须做某事表示必须做某事,具有具有强制性强制性,表示责任或者义务表示责任或者义务I must turn it on.

5、You must not switch it off.Must they leave?Yes, he must./No, she mustnt.When giving a negative reply, mustnt can be replaced with neednt when there is no reason to do something,e.g., Must I take my umbrella? No, you neednt.mustnt 不准不准neednt 不必不必 We often use signs as well as words to tellpeople what

6、 to do or what not to do. Work in pairs to explain these signs. S1 says the sentences to S2. S2 gives the letters of the signs.1You must turn left.2You must be careful.3You must not smoke.4You must pay ten yuan.5You must not cycle.6You must not turn right.7You must not make a noise.8You must not ent

7、er.hcfdabegadmission 入场费入场费must 没有过去式没有过去式,要表达过去的含义要表达过去的含义,我们可以我们可以使用使用had to 代替代替 must.我们昨天不得不去银行.We had to go to the bank yesterday.昨晚我不得不走回家.I had to walk home last light.have to 强调义务和责任是强调义务和责任是由于某种客观原因由于某种客观原因,并非说话者本人能控制并非说话者本人能控制.(must是强制性的责任是强制性的责任义务义务)I have to stay at home, its raining hea

8、vily.I have to work late tonight. My boss has told me to. May I have my packet of electricity, please?Yes, you may.We use may and may not to askfor and give permission. We also use can and cannot (cant) forthe same reason.请求对方的许可请求对方的许可,或是允或是允许别人做某事时许别人做某事时,常用常用may和和can, 但但may比较比较礼貌和正式礼貌和正式,can比较常比较

9、常用用.You may/can sit down.You may not/cannot leave.May/Can they come in?Yes, he may/can.No, she may not/cant.A Benny is asking his sister some questions.What is he asking her? Make questions for Benny. Use May or Can and words from the box.borrow your new bicyclecarry your bag for youswitch on the TV

10、get you a chairopen the doorMay/Can I get you a chair(, please)?May/Can I open the door(, please)?borrow your new bicyclecarry your bag for youswitch on the TVget you a chairopen the doorMay/Can I carry your bag for you(, please)?May/Can I switch on the TV (, please)?May/Can I borrow you new bicycle

11、 (, please)?*B Ask proper questions according to the givensituations, using May or Can.1If you stand up and the teacher has forgotten to tell you to sit down, what can you say?2If it is very hot in the classroom, what can you say?3If you find it very difficult to breathe because the room is too stuffy, what can you say?4If it is raining outside, what can you say?5If you want to go to the toilet, what can yo