Auxiliary Verbs: To have
The auxiliary verb "
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Negative sentences are formed by adding "not", and questions by using inversion.
Questions and negatives in the Present Simple and Past Simple are formed using "do", "does" and "did", for example:
- Did you go to school today?
- She doesn't know my name.
In British English to express possesion "have got" is also used:
- Have you got a new car?
The verb "to have" is the most common auxiliary used for perfect tenses.
"Have to"
"have + to-infinitive" is used to express duty and obligation.
- We have to tidy our rooms once a week.
- She had to see a doctor after 2 weeks.
Read about other uses of to have