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English Grammar Reference: Different forms of have

Have is sometimes a main verb and sometimes an auxiliary verb. When have is a main verb, the auxiliary verb is not have (unless we are using the present perfect) so we have to use a different auxiliary verb.

Look at these sentences:

Have as main verb

Action verb

Positive

Negative

Question

I have a shower every day

I don't have a shower every day.

Do you have a shower every day?

I have breakfast at 8 am.

I don't have breakfast at 8 am.

Do you have breakfast at 8 am?


Possession

Positive

Negative

Question

I have a car.

I don't have a car.

Do you have a car?

I have brown eyes.

I don't have brown eyes.

Do you have brown eyes?


Obligation

Positive

Negative

Question

I have to pay taxes.

I don't have to pay taxes.

Do you have to pay taxes?

I have to get up at 7 o'clock on Mondays.

I don't have to get up at 7 o'clock on Mondays.

Do you have to get up at 7 o'clock on Mondays?


Have as an auxiliary verb

Possession

Positive

Negative

Question

I've got a car.

I haven't got a car.

Have you got a car?

I've got brown eyes.

I haven't got brown eyes.

Have you got brown eyes?


Present Perfect

Positive

Negative

Question

I've been to America.

I haven't been to America.

Have you been to America?

I've finished my meal.

I haven't finished my meal.

Have you finished your meal?