The document discusses the differences between various words used to express obligation, necessity, prohibition, and advice in English:
- Have to is used to describe an external obligation or rule that must be followed, such as a work requirement. Must is used when the obligation is based on the speaker's opinion.
- Mustn't and don't have to have opposite meanings - mustn't expresses prohibition while don't have to means something is not required.
- Should is used to give advice or an opinion about what is right, but is less strong than must or have to. Ought to has the same meaning as should but is more formal.
- Examples are provided to illustrate the proper uses of have
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3. Have to
Have to is NOT a modal verb. We need do/does/did to
make negatives and questions in present and past.
•Do you have to get up early tomorrow? (NOT Have you
to get up early?)
•Did you have to change the sound card?
•We don’t have to stay until the end.
We can use have to in all the verb forms (present, past
and perfect tenses, gerund, to infinitive, etc.)
•I don’t like having to get up early.
•She’s had to work at weekends since she started
working.
•I had to cancel the meeting.
It is used to describe an obligation, a rule, something that
is necessary.
•You have to drive on the left in England.
•I’ll have to get up early tomorrow. The exam is at 8.
4. Must
Must is a modal verb and it has a present form,
which can be used to talk about the present or the
future. The negative form is must
not or mustn’t and the question is must I, must
you, etc.
•I must go to the doctor.
•I must get up early tomorrow.
•You mustn’t call me before 8.
It is used to describe something that the speaker
thinks is necessary to do.
•You must eat less candy.
•I must try to do more exercise.
We can also use must to express strong advice.
•You must see the new film; it’s amazing!
6. Must or Have
to ?
Must only has a present form, so for all other verb
forms (past, future, perfect forms, infinitive, etc.) we
need to use have to.
•You will have to come with me.
•We had to drive very fast.
We normally use have to for questions. Questions
with must are not common.
•Do we have to sit here?
Regarding the meaning, sometimes there is little
difference between have to and must.
•I must go to the hospital.
•I have to go to the hospital.
But we normally use have to when there’s
an external obligation, and must when the
obligation comes from the opinion of the speaker.
7. Must or Have
to ?
•We have to get up early tomorrow.
The meeting is at nine. (external
obligation)
•We must get up early tomorrow if
we want to finish painting. (it’s the
speaker’s opinion)
•You have to wear a suit at the
meeting. (it’s a rule in the company)
•You must buy a new suit for the
meeting. (it’s my opinion)
8. Mustn’t or
Don’t have to?
Don’t have to and mustn’t have opposite meanings. We
use don’t have to when we don’t need to do something,
when there’s no obligation; and we use mustn’t to talk
about prohibition, when there is obligation not to do
something.
•You mustn’t wait here. (=it’s not allowed)
•You don’t have to wait here. (=you can do it, but it’s not
necessary)
If you don’t have to do something, it means that you can do
it if you want, but you don’t need to do it.
Can’t/be not allowed to = mustn’t
We can use can’t or be not allowed to instead of mustn’t.
•You mustn’t smoke in this area. = You are not allowed
to/can’t smoke in this area.
•Children mustn’t eat chewing gum. = Children can’t/are
not allowed to eat chewing gum.
9. Should,
shouldn’t
Should is used to give advice or
an opinion about what we think is right or
wrong.
•You should go to a therapist.
•I think schools shouldn’t offer soft drinks
to their students.
Should is not as strong as must or have
to.
•You should be patient with me. (=advice)
•You must be patient with me. (=strong
advice)
10. Ought to/
ought not to
Ought to/ought not to =
should/shouldn’t
Ought to has the same meaning
as should, although it is more
formal and not as common.
•You ought to go to a therapist.
•You ought not to be so strict
with your daughter
11. Choose the correct option to complete the sentences below.
1When we were at school we ought to/had to /must wear a uniform.
2You ought not to/mustn’t/don't have to be an expert to use the basic functions
of program.
3You 've got/should/must to tell her that you are sorry.
4We had to/must/had got to go to the meeting. Why didn't you go?
5I shouldn’t/mustn’t/don't have to wear glasses, I still can see perfectly well.
6We went to bed right after dinner because we had to/should/must get up early the
following day.
7We must/should to/can't go for a drink one day.
8You shouldn’t/didn't have to/hadn't to take any money. It wasn't necessary.
9What are you doing? You don't have to/ought not/must not be here!
10We weren't allowed to/mustn’t/shouldn't talk to each other because it was an exam.