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Past modals
MíriamTomàs
Logical assumptions and
deductions
How can we express certainty,
probability or speculation?
Let’s put on
the thinking
cap
must
You have been practising all day,
you must be exhausted!
must
Sean and Jennie must be going out again. I’ve seen
them talking very lovey-dovey, you know.
Logical assumptions and deductions
Must:
▪ is used in affirmative sentences.
▪ states something about which you are certain that is true.
Modal verbs and different tenses
We can use modal
verbs with different
combinations of
verbs to change the
time of the actions.
must
You have been practising all day,
you must be exhausted!
must
You have been practising all day,
you must be exhausted!
Infinitive = present
speculation
must
Sean and Jennie must be going out again. I’ve seen
them talking very lovey-dovey, you know.
Infinitive + gerund (continuous) = in
progress at the time of speaking
must
Sean and Jennie must be going out again. I’ve seen
them talking very lovey-dovey, you know.
must
I must have left my phone at Anna’s.
I definitely remember having it there.
must
I must have left my phone at Anna’s.
I definitely remember having it there.
Have + past participle =
speculation about the past
Next!
Can’t and couldn’t
What you say about Claire and Jake can’t be true!They’re so
good together it’s impossible they’re going to break up.
Someone’s been at home, but it can’t have been James, he
was at work.
Can’t and couldn’t
You couldn’t have seen their faces. It was too dark.
Can’t and couldn’t
Couldn’t = when the speculation is
about the distant past
Can’t and couldn’t
▪ Can’t and couldn’t are used in negations and express negative
logical assumptions.That is to say, you use them when you’re
certain that something is not true or real.
Monsters can’t be real!
Can’t and couldn’t
▪ Can’t and couldn’t are the opposite of must. So we
don’t say:
Monsters mustn’t be real!
but:
Monsters can’t be real!
Infinitive = speculation about
the present
Can’t and couldn’t
What you say about Claire and Jake can’t be true!They’re so
good together it’s impossible they’re going to break up.
Someone’s been at home, but it can’t have been James, he
was at work.
Can’t and couldn’t
Have + past participle =
speculation about the past
The children can’t be studying. I can hear them
gossiping.
Can’t and couldn’t
Infinitive + gerund = speculation
about an action in progress at the
time of speaking
Possibility and probability
They might have been a perfect match, but something
got in their way.
May and might
Someone might have stolen your wallet when you got
off the train.
May and might
He hasn’t arrived yet. I may have given him the wrong
directions.
May and might
We use may and might when we think it’s possible that
something’s happened or is true.
May and might
We’re not 100% sure!
He hasn’t arrived yet. I may have given him the wrong
directions.
He might be lost.
He might be looking for the right directions.
May and might
Different tenses can also be
used:
Infinitive  present
Have + past part.  past
Infinitive + gerund  action
in progress
Regret & criticism
You ought to have fed the
cat and dog.
It’s my fault. I should have
told you earlier my mother
was coming.
Should and ought to
▪ Should have + past participle is used to criticise someone’s
actions or lack of them in the past, or in other words to say that
somebody didn’t do the right thing in the past.
Ought to have + past
participle is used as
an alternative to
should
Now it’s your
turn!
Go to page 156 to complete
exercise 3.
Modal verbs for speculation and deduction

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Modal verbs for speculation and deduction

  • 3. How can we express certainty, probability or speculation? Let’s put on the thinking cap
  • 4. must You have been practising all day, you must be exhausted!
  • 5. must Sean and Jennie must be going out again. I’ve seen them talking very lovey-dovey, you know.
  • 6. Logical assumptions and deductions Must: ▪ is used in affirmative sentences. ▪ states something about which you are certain that is true.
  • 7. Modal verbs and different tenses We can use modal verbs with different combinations of verbs to change the time of the actions.
  • 8. must You have been practising all day, you must be exhausted!
  • 9. must You have been practising all day, you must be exhausted! Infinitive = present speculation
  • 10. must Sean and Jennie must be going out again. I’ve seen them talking very lovey-dovey, you know.
  • 11. Infinitive + gerund (continuous) = in progress at the time of speaking must Sean and Jennie must be going out again. I’ve seen them talking very lovey-dovey, you know.
  • 12. must I must have left my phone at Anna’s. I definitely remember having it there.
  • 13. must I must have left my phone at Anna’s. I definitely remember having it there. Have + past participle = speculation about the past
  • 14. Next!
  • 15. Can’t and couldn’t What you say about Claire and Jake can’t be true!They’re so good together it’s impossible they’re going to break up.
  • 16. Someone’s been at home, but it can’t have been James, he was at work. Can’t and couldn’t
  • 17. You couldn’t have seen their faces. It was too dark. Can’t and couldn’t Couldn’t = when the speculation is about the distant past
  • 18. Can’t and couldn’t ▪ Can’t and couldn’t are used in negations and express negative logical assumptions.That is to say, you use them when you’re certain that something is not true or real. Monsters can’t be real!
  • 19. Can’t and couldn’t ▪ Can’t and couldn’t are the opposite of must. So we don’t say: Monsters mustn’t be real! but: Monsters can’t be real!
  • 20. Infinitive = speculation about the present Can’t and couldn’t What you say about Claire and Jake can’t be true!They’re so good together it’s impossible they’re going to break up.
  • 21. Someone’s been at home, but it can’t have been James, he was at work. Can’t and couldn’t Have + past participle = speculation about the past
  • 22. The children can’t be studying. I can hear them gossiping. Can’t and couldn’t Infinitive + gerund = speculation about an action in progress at the time of speaking
  • 24. They might have been a perfect match, but something got in their way. May and might
  • 25. Someone might have stolen your wallet when you got off the train. May and might
  • 26. He hasn’t arrived yet. I may have given him the wrong directions. May and might
  • 27. We use may and might when we think it’s possible that something’s happened or is true. May and might We’re not 100% sure!
  • 28. He hasn’t arrived yet. I may have given him the wrong directions. He might be lost. He might be looking for the right directions. May and might Different tenses can also be used: Infinitive  present Have + past part.  past Infinitive + gerund  action in progress
  • 30. You ought to have fed the cat and dog.
  • 31. It’s my fault. I should have told you earlier my mother was coming.
  • 32. Should and ought to ▪ Should have + past participle is used to criticise someone’s actions or lack of them in the past, or in other words to say that somebody didn’t do the right thing in the past. Ought to have + past participle is used as an alternative to should
  • 33. Now it’s your turn! Go to page 156 to complete exercise 3.