has to/have to used

• to expresses general obligations

• to express the very important idea or necessary

e.g :​ I have to wake up at 4.30 in the morning.

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Means: I must wake up or unless I'll be late.

Positive form

​In the present:

She/He/It + has to + complement

I/You/They/We​ + have to + complement

​​

• She has to wear glasses to see clearly.

• I have to join zoom before 7.30.

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What do you have to do before the test?

• I have to study before the test.

• I have to sleep well before the test.

What does she have to do to make a pancake?

• She has to see the recipe.

• She has to buy the ingredients.

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Positive form

​In the past:

She/He/It + had to + complement

I/You/They/We​ + had to + complement

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• ​​2 years ago I had to come to school to attend the class.

• Ancient people had to ride on a camel or a horse to travel places far away.

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Negative form

​In the present:

She/He/It + doesn't have to + complement

I/You/They/We​ + don't have to + complement

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• We don't have to run. We can walk.

• You don't have to pay for this meal. It's free.​

• ​He doesn't have to work because he is sick.

• ​She doesn't have to help me. I can do it myself.

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doesn't/​don't have to become choice if they put in sentence. If you want to, you can but you don't have to.