Must - Have to - Need

1. personal / present + future
   1. I must finish this by tonight .

1. external/ present + future
   1. You have to drive on the left when you are in England.

1. past
   1. When I was at school , I had to wake up at 7 o'clock every morning .

1. present +future
   1. You must't park here.

1. present + future
   1. I need to know who will come .

1. past
   1. We needed to some more soft drinks , so we went to the supermarket.

1. Question + Negative
   1. Need you go out ?
   2. She needn't go out.

1. Present + Future
   1. You don't have to call us again .
   2. He doesn't need to send his CV again
   3. You needn't worry. Everything is under control.

Annotations:

• didn't 

1. past
   1. I didn't have to / need to pick up the kids from school.

1. past
   1. You needn't have brought anything.