Must + Perfect : Dùng để nói về một tiên đoán xảy ra trong quá khứ nhưng dựa trên những cơ sở rõ ràng Eg: - I have lost one of my gloves.. I must have dropped it somewhere.[r]
(1)MODAL VERB + PERFECT I FORM
Chú ý: Sau động từ khiếm khuyết luôn động từ nguyên mẫu (bare-inf)
1 Could/ May/ Might + perfect:có thể là
Dùng để tiên đốn q khứ khơng có sở Những động từ khiếm khuyết mang nghĩa
Eg: - It may have rained last night, but I am not sure - The cause of death could have been bacteria - John might have gone to the movies yesterday
2 Must + Perfect: Dùng để nói tiên đốn xảy q khứ dựa sở rõ ràng Eg: - I have lost one of my gloves I must have dropped it somewhere
- My wacth says only ten past six It must have stopped
3 Should (not) + Perfect: Nên (khơng nên) làm việc khứ - You shouldn’t have come to school late
- We didn’t play very well We should have played better Chú ý: Có thể thay should = ought to
4 Need(not) + Perfect: Cần khơng cần làm điều q khứ Eg: - You needn’t have bought her such a precious present
- We needn’t have gone to the supermarket There’s enough food at home
5 Would rather + Perfect: Ước muốn không xảy khứ
Eg: - The film at the cinema was boring I would rather have stayed home to watch TV
- He studied French at schoo; only because his parents wanted him He would rather have studied English
II EXERCISE Exercise 1 Multiple choice:
1 When my father was young, he ……… work in the garden for long hours A can B could C will D should He ……… have committed the crime because he was with mw all day
A mustn’t B shouldn’t C won’t D couldn’t Since we have to be there by 8.30, we ……… take a taxi
A had better B may C could D are able to It ……… rain this afternoon Why don’t you take an umbrella?
A could be B must C might D had better ……… you help me with the homework?
A May B Shall C Should D Will She hasn’t eaten anything since yesterday She ……… be very hungry A might B will C must D can I put my keys on the table, but noe it’s gone Someone ……… have taken it
A had to B may C should D would rather
8 Daisy is reading her English text because she has a test tomorrow She ……… be studying A will B should C must D can
9 We ……… put the fish in the fridge before it boils
A had to B can C may D had better 10 Mr Brown is very rich He ……… work hard for a living
A mustn’t B shouldn’t C can’t D doesn’t have to 11 Tom has just got a new job He ……… be very pleased
A migh B must C should D will
12 Tom painted his room black It looks dark and dready He ……… have chosen another color A should B must C could D may
(2)13 ……… you carry this bag for me?
A May B Should C Will D Shall 14 You ……… throw litter on the street
A mustn’t B couldn’t C needn’t D won’t 15 Look at those black clouds It ……… rain soon
A may B might C will D is going to
Exercise 2: Put the verbs in the brackets in the correct form If I had a bike, I ……… (ride) it every day
2 George ……… (go) on a trip to Chicago if he had had a time
3 Marcella didn’t come to class yesterday She ……… (have) an accident
4 John didn’t his homework, so the teacher became very angry John ……… (do) his homework Sharon was suppoted to be here at nine oc’lock She ……… (forget) about out meeting
6 Where you think Jane is today? She ……… (sleep) late George missed the class today He ……… (have) an accident Robert arrived without his book He ……… (loose) it
9 Thomas received a warn ing for speeding He ……… (drive) so fast 10 Henry’s car stopped on the highway It ……… (run) out of gas
Exercise 3: Rewrite the following sentences, using the modal verb in the bracket It was a mistake not to bring your umbrella (should)
……… I can imagine how worried Tom’s father was (must)
……… It is possible that one of the men died on the mountain (may)
……… It wasn’t necessary for you to all this work (needn’t)
……… It was a mistake for you to buy that house (shouldn’t)
……… I don’t think Sally enjoyed her holiday (can’t)
……… Perhaps Alan didn’t mean what he said (mightn’t)
……… It was the driver’s fault He didn’t stop at the red light (should)
……… It’s possible that I left my wallet at home (could)
……… 10 Perhaps he spent all his money when he was young (might)