have to must practice
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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
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I have to mop the floor
You must mop the floor right
now!
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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
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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
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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
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To express Possibility:MUST + HAVE + PAST HAVE + PAST PARTICIPLE PARTICIPLE
To express Obligation: The past of MUST is
HAD TO HAD TO
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She must have cleaned must have cleaned the house yesterday
She had to had to clean the house yesterday
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You had to clean all the house
You must clean all the house !
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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
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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
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PROHIBITIONPROHIBITION
You must not go to the party.
Going to the party is Going to the party is prohibited.prohibited.
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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.
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•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:
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You _________ do
your homework
I _________ domy homework
MUSTMUST
HAVE HAVE TOTO
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It’s late…I ____ go home…I don’t want
miss the dinner
MUSTMUST
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Be quiet!You ________
make noiseMUSTN’TMUSTN’T
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We _________ get home
early. Mum wants us
before the dinner
HAVE TOHAVE TO
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You _________ clean the kitchen.
I’ve already done it.
DON’T HAVE DON’T HAVE TOTO
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To be honest… I think you _______
change your boyfriend
MUSTMUST
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I like wearing jeans and
t-shirts , but in the office I
__________
wear formal clothes
HAVE TOHAVE TO
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I am overweight . I ________
do exercises everyday.
MUSTMUST
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You _________ bring your dog here.
MUSTN’MUSTN’TT
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I’m on my holidays so I _________ worry about anything…There’s no
need to do it.
DON’T HAVE DON’T HAVE TOTO
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Ok! I get it.I don’t need your help…
You ___________
be here…DON’T HAVE DON’T HAVE
TOTO
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BYE