Grammar Unit Have to/don't have to

Have to/don´t have to

• We use have to to say that it´s necessary or very important to do something

          Ex: I´m late I have to go now

                Jimmy is very ill, he has to stay in bed

• We use the negative form don´t/doesn´t have to to say that it isn´t necessary or important to do something.

          Ex: It´s early so I don´t have to hurry

                Diana doesn´t have to get up early on Sundays.

• Questions are formed with do/does.

          Ex: Do I have to go to school?

                Does he have to pay?

• The past form is had to/didn´t have to. The form is the same for all subjects.

          Ex: Joanna had to go to the dentist last week

               Yesterday, was a holiday, so we didn´t have to go to school.

               Did you have to do the ironing last night?

• All forms of have to are followed by the base form of the verb.