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5. MUST
  • We use must when we feel something is true.

EXAMPLE: You have been talking for so long your mouth must be very dry now.

 

  • We use must when it is necessary to do something.

EXAMPLE: I haven't seen my parents for a long while. I must visit them at the weekend.

 

  • We can use must for the present or future.

EXAMPLE: We must leave now before the weather gets worse.
EXAMPLE: We must leave very early tomorrow or we will be late.

 

  • We use must have for something that we think happened in the past.

EXAMPLE: He must have gone out while I was sleeping.