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Learn English > English lessons and exercises > English test #113126: Can't or Mustn't
Can't or Mustn't
Interdiction? Incapacity? Impossibility? CAN'T? MUSTN'T?
- Yes, you may go out ( permission), but you can't ( impossibility which is the same as an interdiction) stay out beyond the deadline.
- You must (obligation) take your cap off, and you can't (= interdiction) put it back before you go out.
II) Mustn't:= interdiction. ( must = obligation)
- You mustn't answer back when someone scolds you. It's rude.
III) CAN'T HAVE + past participle: in the past, you must use the construction: "can't + have + past participle", in order to express impossibility and incapacity in the past.
- She can't have found the key... It was hidden where she couldn't go!
- "No smoking inside the building." "No walking on this lawn."
There you are! You know everything! Time to face the test ! Go for it ! Let the FORCE be with you...
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