MUST
"Must" is a modal verb most commonly used to express certainty. It can also be used to express necessity or strong recommendation, although native speakers prefer the more flexible form "have to." "Must not" can be used to prohibit actions, but this sounds very severe; speakers prefer to use softer modal verbs such as "should not" or "ought not" to dissuade rather than prohibit.
examples
This must be the right address!
Students must pass an entrance examination to study at this school.
You must take some medicine for that cough. strong recommendation
Jenny, you must not play in the street! prohibition
MODAL USE
Modal Use Positive Forms
- = Present 2. = Past 3. = Future Negative Forms
- = Present 2. = Past 3. = Future Also use:
MUST
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certainty 1. That must be Jerry. They said he was tall with bright red hair.
- That must have been the right restaurant. There are no other restaurants on this street.
- NO FUTURE FORM
- That must not be Jerry. He is supposed to have red hair.
- That must not have been the right restaurant. I guess there is another one around here somewhere.
- NO FUTURE FORM
have to