Must / Have to (Explanation and Videos)

Must and  have to  are all used to express obligation or the need to do something. They can be used interchangeably in the present tense, except that must suggests that it is the speaker who has decided that something is necessary, whereas have to suggest that somebody else has imposed the decision.  
  • I must clean the house before mum gets back. I want her to find it all neat and tidy.
  • Sorry, I can't come out now. I've got to tidy up my room before I'm allowed out.
  • He has to attend the clinic every two weeks. He's really quite seriously ill.
  • You must come and visit us again soon. It's ages since we saw you.
 We have to use have to for the negative of must when there is no obligation or necessity to do something: 
  • You don't have to drink champagne at the reception. You can have a soft drink. 
  • I didn't have to play after all. Jane turned up and could partner Alice.
  • You won't have to drive Tom to the airport next Saturday. Julie's taking him. 
We use mustn't to say that something is not allowed
  • You mustn't drink if you're going to drive afterwards.
  • You mustn't drink that water. It's contaminated.
  • You mustn't lie under oath. If you do, that's perjury. 
  • I mustn't forget my keys. I'll put them here so that I remember them.

Please  take a  closer look to the explanation   found  here and  its  exercises :  Must / have to


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