uses of have and don´t have to

2. HAVE TO
 We use have to to talk about strong obligation that
comes from somewhere else, for example from you
boss, you parents, a rule at school or work.
 Examples:
I have to be home by ten. (My parents told me so.)
I must be home by ten. I have a very difficult day
tomorrow. (It is my own decision.)
I have to get up early, because I start work at 8. (It
is a rule.)
I should get up early. (Now I stay in bed until
lunchtime.)

3. HAVE TO
AFFIRMATIVE
SUBJECT MODAL VERB EXAMPLES
SENTENCES
I have to clean
my room.
You have to get
I a new book.
affirmative you We have to
have to clean
sentences we pick up the
get
(+) they laundry.
pick up
They have to
NECESSITY: have
have a
have to/has to eat
notebook.
means it is go
work He has to eat
necessary.
he dinner now.
she has to She has to go
it to work now.
It has to work.

4. DON’T HAVE TO
 Don't have to means that there isn't any obligation at all,
there is no need to do it.
 Don't have to is different from shouldn't and mustn't.
 Examples:
I don't have to get up early at weekend.
(I can stay in bed as long as I want.)
You mustn't tell lies. (It is very bad to tell lies.)
You don't have to go with me.
(You can go with me if you want to.)
You shouldn't smoke. (It is bad for your health.)
** We do not use have to when we talk about what is a good
idea to do, but we don't do it yet. Instead, we use should

5. DON’T HAVE TO
NEGATIVE
SUBJECT MODAL VERB EXAMPLES
SENTENCES
I don't have to
negative work on Saturday.
sentences I You don't have to
(-) you do that.
don't have to
we work We don't have to
LACK OF they do clean the car.
NECESSITY: clean They don't have to
don't have eat eat pizza.
to/doesn't have work
go He doesn't have
to
be to work tomorrow.
means it is not he
She doesn't have
necessary. she doesn't have to
to go today.
You have a it
It doesn't have to
choice. be that way.

6. INTERROGATIVE FORM
QUESTIONS DO SUBJECT MODAL VERB EXAMPLES
Do I have to clean
my room?
I Do you have to get a
you new book?
Do
we clean Do we have to pick
they get up the laundry?
pick up Do they have to have
questions
have to have a notebook?
(?)
eat
go
Does he have to eat
work
dinner now?
he
Does she have to go
Does she
to work now?
it
Does it have to
work?

7. EXERCISES (THE SECRETARY)
Read the advertisement, then choose the correct words below.
Help Wanted: Secretary. No experience necessary. Must type 50
words per minute. Work Monday-Friday, weekends off. Answer
phones, use computer, file reports.
have to
has to
1. The secretary ___ know how to type.
don't have to
doesn't have to
have to
has to
2. A secretary ___ be a woman. The secretary can be a man.
don't have to
doesn't have to
Do / have to
Does / have to
3. ___ the secretary ___ work Saturdays?
Do / has to
Does / has to
have to
has to
4. No, he/she ___ go to work on saturdays.
don't have to
doesn't have to

8. EXERCISES (THE SECRETARY)
have to
5. The secretary also ___ answer the company's has to
phones.... don't have to
doesn't have to
have to
has to
6. ...and he/she ___ file reports every week.
don't have to
doesn't have to
Do / have to
Does / have to
7. ___ the secretary ___ use a computer?
Do / has to
Does / has to
have to
has to
8. Yes, He or she ___ use a computer.
don't have to
doesn't have to

9. EXERCISES (THE HEALTH)
have to
has to
9. People ___ eat food to stay alive.
don't have to
doesn't have to
have to
10. People ___ eat pizza and candy to stay alive. They can has to
choose healthy food. don't have to
doesn't have to
have to
has to
11. A person ___ drink water to stay alive.
don't have to
doesn't have to
have to
has to
12. A person ___ smoke cigarettes to stay alive.
don't have to
doesn't have to