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MODALS OF DEDUCTION & SPECULATION
PRESENT
MUST Almost sure something is true.
She must be rich. She drives a Ferrari and her dog has a diamond
necklace
CAN’T Almost sure something isn’t true.
There’s a knock on the door. It can’t be the postman. It´s Sunday
MAY/MIGHT/COULD Possible that something is true.
I haven’t seen James today. He may/might/could be off sick.
SHOULD Something you expect to happen
If I send the parcel today, it should be delivered on Wednesday.
PAST
MUST HAVE
vs
CAN’T HAVE
1. MUST HAVE: CERTAINTY = POSITIVE DEDUCTION
He left without saying goodbye. He must have been in a hurry.
2. CAN’T HAVE: CERTAINTY = NEGATIVE DEDUCTION:
He can’t have earned so much money. (I’m sure he didn’t)
3. Both can be used with CLEARLY, SURELY or OBVIOUSLY in
exclamations:
Surely you can’t have drunk all of it in one gulp!
Obviously you must have noticed how furious he was!
SHOULD HAVE
&
OUGHT TO HAVE
1. EXPECTATION: should have refers to something which was
supposed to happen.
He should have received my parcel by now
She ought to have bought the lottery ticket
2. CRITICISM OF AN ACTION:
You shouldn’t have drunk so much at the party!.
COULD HAVE
1. POSSIBILITY:
Sharon could have been promoted if she had tried (possibility /
ability).
2. UNCERTAINTY:
It could have been Andrew who phoned me, I suppose.
MAY HAVE
&
MIGHT HAVE
1. UNCERTAINTY:
Now that I think of it, I may have been rather critical.
They might not have received our parcel yet.
2. MIGHT HAVE is used to express ANNOYANCE at someone’s
failure:
You might have told me my trousers were split.
MODAL AUXILIARY VERBS PRACTICE
Rewrite these sentences using the verbs given:
1. It wasn’t very nice of you not to invite us to your wedding. (MIGHT)
You...
2. It wouldn’t have been right to let him do all the cleaning . (COULDN’T)
I...
3. I don’t believe that you have missed the train again. (CAN’T)
You...
4. Perhaps they didn’t notice the yoghourt was sour. (MAY)
They...
5. It’s possible that this kind of spider is poisonous. (COULD)
This spider...
6. I’m disappointed you didn’t back me up in the meeting. (MIGHT)
You ...
7. It would have been possible for Emily to give us a lift . (COULD)
Emily ...
KEY:
1. You might have invited us to your wedding
2. I couldn´t let him do all the cleaning
3. You can´t have missed the train again
4. They may not have noticed the yoghourt was sour
5. This spider could be poisonous
6. You might have backed me up in the meeting
7. Emily could have given us a lift
Edited by Öznur Ş. Yalgın

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Modals of deduction_and_speculation (present & past)

  • 1. MODALS OF DEDUCTION & SPECULATION PRESENT MUST Almost sure something is true. She must be rich. She drives a Ferrari and her dog has a diamond necklace CAN’T Almost sure something isn’t true. There’s a knock on the door. It can’t be the postman. It´s Sunday MAY/MIGHT/COULD Possible that something is true. I haven’t seen James today. He may/might/could be off sick. SHOULD Something you expect to happen If I send the parcel today, it should be delivered on Wednesday. PAST MUST HAVE vs CAN’T HAVE 1. MUST HAVE: CERTAINTY = POSITIVE DEDUCTION He left without saying goodbye. He must have been in a hurry. 2. CAN’T HAVE: CERTAINTY = NEGATIVE DEDUCTION: He can’t have earned so much money. (I’m sure he didn’t) 3. Both can be used with CLEARLY, SURELY or OBVIOUSLY in exclamations: Surely you can’t have drunk all of it in one gulp! Obviously you must have noticed how furious he was! SHOULD HAVE & OUGHT TO HAVE 1. EXPECTATION: should have refers to something which was supposed to happen. He should have received my parcel by now She ought to have bought the lottery ticket 2. CRITICISM OF AN ACTION: You shouldn’t have drunk so much at the party!. COULD HAVE 1. POSSIBILITY: Sharon could have been promoted if she had tried (possibility / ability). 2. UNCERTAINTY: It could have been Andrew who phoned me, I suppose. MAY HAVE & MIGHT HAVE 1. UNCERTAINTY: Now that I think of it, I may have been rather critical. They might not have received our parcel yet. 2. MIGHT HAVE is used to express ANNOYANCE at someone’s failure: You might have told me my trousers were split. MODAL AUXILIARY VERBS PRACTICE Rewrite these sentences using the verbs given: 1. It wasn’t very nice of you not to invite us to your wedding. (MIGHT) You... 2. It wouldn’t have been right to let him do all the cleaning . (COULDN’T) I... 3. I don’t believe that you have missed the train again. (CAN’T)
  • 2. You... 4. Perhaps they didn’t notice the yoghourt was sour. (MAY) They... 5. It’s possible that this kind of spider is poisonous. (COULD) This spider... 6. I’m disappointed you didn’t back me up in the meeting. (MIGHT) You ... 7. It would have been possible for Emily to give us a lift . (COULD) Emily ... KEY: 1. You might have invited us to your wedding 2. I couldn´t let him do all the cleaning 3. You can´t have missed the train again 4. They may not have noticed the yoghourt was sour 5. This spider could be poisonous 6. You might have backed me up in the meeting 7. Emily could have given us a lift Edited by Öznur Ş. Yalgın