Student or Learner
Can you please help me identify the grammatical structures of:
1.' be going to' as in " Oh no! We're going to crash!."
2. '(have) something (done)' as in "I had my hair cut"
3. 'must have (done)' as in "he must have forgotten"
4. ' used to live/believe/wear' as in "He used to live here"
This sounds like it might be a homework assignment. If you try to answer it yourself, I, or one of the other teachers here, will guide you in the right direction.