Have To And Must

Question 1

I have to do something

Answer 1

It is necessary to do it, I’m obliged to do it
باید کار رو‌ انجام بدی، الزام هست که کار رو انجام بدی

You can’t turn right here. You have to turn left.
I have to wear glasses for reading.
Last week Tina broke her arm and had to go to hospital.
I haven’t had to go to the doctor for ages.

Question 2

Use DO/ DOES/ DID
In question and negative sentences
For present and past simple

از افعال کمی استفاده می‌کنیم

Answer 2

What do I have to do to get a new driving licence?

Karen doesn’t have to work Saturdays.

Why did you have to leave early ?

Question 3

You can say

I’ll have to …
I’m going to have to …
I might/ may have to

Answer 3

They can’t fix my computer so I’ll have to buy a new one. Or I’m going to buy a new one.

Tom might have to work tomorrow. Or Tom may have to work

Question 4

Must is similar to have to
You can use must or have to

Answer 4

Mark is a really nice person. You must meet him

Question 5

We use have to ( not usually must ) to say what someone is obliged to do. The speaker is not giving his or her own opinion.

It is a fact not an opinion

Answer 5

I have to work from 8:30 to 5:30 everyday.

Jane has to travel a lot for her work.

Question 6

Must is used in written rules and instructions

Answer 6

Applications for the job must be received by 18 May.

You must write your answers in ink.

Question 7

Can’t use must to talk about the past

Answer 7

We didn’t have much time. We had to hurry.

Question 8

Mustn’t and don’t have to are completely different

Answer 8

You mustn’t do something : it is necessary that you do not do it ( so don’t do it )

You must keep this a secret. You mustn’t tell anyone.

I promised I would be on time. I mustn’t be late.

You don’t have to do something : you don’t need to do it but you can if you want to

You don’t have to tell Tom what happened. I can tell him myself.

I don’t have to be at the meeting, but I think I’ll go anyway.