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"Must vs. Have to" and "Can", González Fernández…
"Must vs. Have to" and "Can"
Can
Use
Ability or possibility
I can draw
Permission
I can watch the tv
in Question?
Do you have the ability? (is it possible)
to make an after
Instructions or Request
Structure
Afirmative
Subject +
I/you/ he/she/it/we/ you/ they
Example
Correct
she can speak english
He can swim well.
1 more item...
Incorrect
she can speaks english
she can to speak english
Can +
Verb
The infinitive without to
We don't add an 'S'
Negative
Subject +
I/you/ he/she/it/we/ you/ they
Can´t +
Can't = Cannot
Example
I can't swim.
We can't go to the cinema tonight.
Verb
The infinitive without to
We don't add an 'S'
Question
Subject +
I/you/ he/she/it/we/ you/ they
Example
Can you speak Japanese?
Can´t you play the guitar?
short answers
Yes, you can.
No, I can't.
Verb
?
The infinitive without to
We don't add an 'S'
Can/Can´t +
Can't = Cannot
What /When/ Where
Must
Use
Obligation or Durty
Deduction
Emphasize Necessity
Strong recommendation
it is not allowed
It is prohibited
The speak decides that something is necessary
1 more item...
Structure
Negative
Subject +
I/you/ he/she/it/we/ you/ they
Example
They mustn't go to the party.
He must not talk like that.
Mustn't / must not +
Verb
The infinitive without to
We don't add an 'S'
Afirmative
Subject +
I/you/ he/she/it/we/ you/ they
Example
You must go to school.
I must study math.
Must +
Verb
The infinitive without to
We don't add an 'S'
Question
Must / Mustn't +
What /When/ Where
Subject +
I/you/ he/she/it/we/ you/ they
Example
Must not we take that?
Must she be back at 10?
Verb
?
The infinitive without to
We don't add an 'S'
Have to
Use
Someone alse other than the speaker has made the decision
other has give us the obligation
for questions it is much more common to use have to instead of must
We use a form of Have to for the other tenses.
Structure
Afirmative
I/you/ we/ they +
he/she/it/ +
Have to +
Has to +
Example
You have to read this book.
She has to buy new clothes.
Verb
Verb
Negative
I/you/ we/ they +
he/she/it/ +
don't Have to +
doesn't have to+
Example
You don’t have to help him
You don’t have to tell me what I already know.
verb
verb
Question
Do +
Does +
I/you/ we/ they +
he/she/it/ +
Example
Did you have to learn at least five new words every day?
Did you have to go home?
have to +
have to +
Verb
Verb
The past tense of must is had to
The future tense of must is will have to
González Fernández Fernando
Hernandez Vargas Diana Yazmin
ISC 11