Must - Have to - Need

Must - Have to - Need

1. Obligation

   • Must
     • personal / present + future
       • I must finish this by tonight .
   • have to
     • external/ present + future
       • You have to drive on the left when you are in England.
   • had to
     • past
       • When I was at school , I had to wake up at 7 o'clock every morning .

2. Prohibition

   • Mustn't
     • present +future
       • You must't park here.

3. Necessity

   • need to
     • present + future
       • I need to know who will come .
   • needed to
     • past
       • We needed to some more soft drinks , so we went to the supermarket.
   • need
     • Question + Negative
       • Need you go out ?
       • She needn't go out.

4. Absence of Necessity

   • don't have to
     • Present + Future
       • You don't have to call us again .
       • He doesn't need to send his CV again
       • You needn't worry. Everything is under control.
   • don't need to
   • needn't
   • didn't have to
     • didn't 
   • didn't need to
     • past
       • I didn't have to / need to pick up the kids from school.
   • needn't have +P.P
     • past
       • You needn't have brought anything.

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