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OBLIGATIONOBLIGATION
HAVE TO HAVE TO : : Impersonal ObligationImpersonal Obligation
It’s a external rule or law.It’s a external rule or law.
MUST:MUST: Personal Obligation
It’s internal rule, decision or opinion
I have to mop the floor
You must mop the floor right
now!
To mop the floor is…The stepmother’s decision
You must must mop the floor right now!
Cindirella just follows the order
I have to have to mop the floor
HAVE TO in affirmative formHAVE TO in affirmative form
Present: Present:
HAVE TO
I, you, they, weHAS TO
He, she, it
Past:Past:HAD TO
I, you, they, we, he, she, it
Future:Future:
WILL HAVE TO
MUST:
MUST I, you, he, she, it, we, they
MUST in affirmative formMUST in affirmative form
MUST is only used in the the present time present time , for the other tenses we use HAVE TO
To express Possibility:MUST + HAVE + PAST HAVE + PAST PARTICIPLE PARTICIPLE
To express Obligation: The past of MUST is
HAD TO HAD TO
She must have cleaned must have cleaned the house yesterday
She had to had to clean the house yesterday
You had to clean all the house
You must clean all the house !
The Negative form of The Negative form of MUST & HAVE TO MUST & HAVE TO
When we use the negative form, the meaning is totally different
PROHIBITION UNNECESITY
HAVE TO AND MUST IN THE NEGATIVEHAVE TO AND MUST IN THE NEGATIVEMUST:
MUST NOT
(MUSTN’ T)
Negative Forms!every grammatical
person.
HAVE TO:Present: Present: Don’t have to
Doesn’t have to
Past:Past:Didn’t have to
Future:Future:Won’t have to
I / we/ you/ they
She/ he / it
Every grammatical person
PROHIBITIONPROHIBITION
You must not go to the party.
Going to the party is Going to the party is prohibited.prohibited.
LACK OF NECESSITYLACK OF NECESSITY
You don’t have todon’t have to cry. We will help you.
It’s not It’s not necessary to cry.necessary to cry.
•You mustn’t go. It’s an order (Don’t go)(Don’t go)
•You don’t have to go, but you can if you want to.
(It’s not necessary)(It’s not necessary)
COMPARE:COMPARE:
You _________ do
your homework
I _________ domy homework
MUSTMUST
HAVE HAVE TOTO
It’s late…I ____ go home…I don’t want
miss the dinner
MUSTMUST
Be quiet!You ________
make noiseMUSTN’TMUSTN’T
We _________ get home
early. Mum wants us
before the dinner
HAVE TOHAVE TO
You _________ clean the kitchen.
I’ve already done it.
DON’T HAVE DON’T HAVE TOTO
To be honest… I think you _______
change your boyfriend
MUSTMUST
I like wearing jeans and
t-shirts , but in the office I
__________
wear formal clothes
HAVE TOHAVE TO
I am overweight . I ________
do exercises everyday.
MUSTMUST
You _________ bring your dog here.
MUSTN’MUSTN’TT
I’m on my holidays so I _________ worry about anything…There’s no
need to do it.
DON’T HAVE DON’T HAVE TOTO
Ok! I get it.I don’t need your help…
You ___________
be here…DON’T HAVE DON’T HAVE
TOTO
BYE