The verb have

The verb have
- The verb have
  The verb “to have” serves two primary functions. First, it is used as a main verb to indicate possession. Second, it is used as a helper verb along with another verb to indicate various tenses.
  - Main verb, possession: I have a car. It has four seats. Their car had four flat tires.
  - Helper verb, present perfect: I have learned some useful information in this course. It has been interesting.
  - Helper verb, past perfect: I had learned some information that had been useful to me.
  - Helper verb, future perfect: I hope that I will have learned from the course, and that it will have been fun.
  Note that the phrases “have to” and “have got to” are verbal phrases that mean approximately “must”.
- had
  - had
    Had is used for 2st, 2nd, and 3rd person, both singular and plural, and it always indicates some sort of past action. Had can be used as a main verb in the simple past tense to indicate possession, or with a helper verb to indicate other types of tenses.
    
    Main verb, past tense: Years ago, Emma had a car.
    
    Helper verb, present perfect: She has had a good career as a race car driver. (=She is still racing.)
    
    Helper verb, past perfect: She had had a good career as a race car driver. (=She has stopped racing.)
- has
  - has
    Has is present tense, and used only for 3rd person singular. Has can be used as a main verb to indicate possession, or as a helper verb to indicate various tenses.
    
    Main verb, present tense: She has a car, and it has four seats.
    
    Helper verb: The weather has been good. He has written a book.
    
    Has is also used with nouns that are plural in themselves, but that act collectively.
    
    The team has a good chance of winning tonight.
- have
  - have
    Have is used in the 1st and 2nd person singular, and the 1st, 2nd, and 3rd person plural. Have can be used as a main verb to indicate possession, or as a helper verb in combination with another verb to indicate various tenses.
    
    Main verb: I/You/We/They have a car.
    
    Helper verb: I have saved enough money, and I have decided to buy a car.
    
    Have is also used when the word “they” is being used to refer to a single person of a non-specified gender.
    
    If a student does the homework, then they have a good chance of passing the class.
- have to / have got to
  - have to / have got to
    The phrases have to/has to/had to and have got to/has got to are verbal phrases that mean approximately “must”.
    
    I have got to go to the store.
    
    To monitor pollution, member states have to set up a network of measuring stations.
    
    It has to be noted that our selection process created bias, and consequently we had to use a different statistical approach.

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had

has

have

have to / have got to