must in the past

must in the past

must in the past:Must +have + past participle expresses a near certainty, a logical conclusion about a past almost always in the affirmative.We use must have to express that we feel sure that something was true in the past.

Positive Forms

• This must be the right address! certainty.
• Students must pass an entrance examination to study at this school. necessity.
• You must take some medicine for that cough. strong recommendation.
• Jenny, you must not play in the street! prohibition.
• 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.
• You must have a permit to enter the national park.
• They must have left early.
• He must have already gone.

must in the past

Negative Forms

• 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.
• You must not swim in that river. It's full of crocodiles.
• You mustn't drink so much. It's not good for your health.
• We don't have to get a permit to enter the national park.
• You mustn't break anything.