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We use  must  to make deductions when we are almost sure or more certain.
For past deductions we use  must +  have + past participle : He’d been working for 10 hours when I saw him. He  must  have been   very tired.
We use  can’t  to make negative deductions from  evidence .  .
For past we use  can’t +  have  +  past participle : He  can’t  have failed   the exam. He’s a very good student!
We use  may/ might / could  to make speculations (i.e. when there is  no evidence ).
We use  may / might / could + have +  past participle   for past: He  may/might/ could  have phoned   while you were out. The answer phone was switched off.
Deduction must have and can't have + past participle The plane ________ ________ run out of fuel. It _________ ________ blown up in mid-air.
Speculation could/may/might have + past participle What could ________ happened to them? They could _____ _____ up on a desert island. Earhart and Noonan may _____ _____ US spies. Aliens _______ _______ abducted them.
We use ________ ________ when we are sure something happened. We use ________ ________ when we are sure something didn't happen. We use _______ _______ ______ ______ to talk about what possibly happened.
 

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Modals of speculation about the past

  • 1.
  • 2.
  • 3.  
  • 4. We use must to make deductions when we are almost sure or more certain.
  • 5. For past deductions we use must + have + past participle : He’d been working for 10 hours when I saw him. He must have been very tired.
  • 6. We use can’t to make negative deductions from evidence . .
  • 7. For past we use can’t + have + past participle : He can’t have failed the exam. He’s a very good student!
  • 8. We use may/ might / could to make speculations (i.e. when there is no evidence ).
  • 9. We use may / might / could + have + past participle for past: He may/might/ could have phoned while you were out. The answer phone was switched off.
  • 10. Deduction must have and can't have + past participle The plane ________ ________ run out of fuel. It _________ ________ blown up in mid-air.
  • 11. Speculation could/may/might have + past participle What could ________ happened to them? They could _____ _____ up on a desert island. Earhart and Noonan may _____ _____ US spies. Aliens _______ _______ abducted them.
  • 12. We use ________ ________ when we are sure something happened. We use ________ ________ when we are sure something didn't happen. We use _______ _______ ______ ______ to talk about what possibly happened.
  • 13.