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Modal Verbs (COULD/COULDN'T (The verb "Could" is the past of…
Modal Verbs
COULD/COULDN'T
The verb "Could" is the past of the verb "Can". We use the verb "Could" to express "ability" and "possibility" in the past .
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We use the verb "Could" to express an ability, that you had in the past.
For example:
She could ran very fast when she was a girl
Finally, we can use the verb "Could" in the questions,
and it remains one more educated way than using can.
For example:
Could you help me, please?
CAN/CAN'T
Present ability:
We can use the verb "Can" and "Can't" to express an ability or a capacity to do a thing.
For example:
She can swim very well
You can't run good
Possibility:
We can use the verb "Can" and "Can't" to express the possibilty to do a thing.
For example:
You can go to the cinema
They can't go to the swimming pool, because they are very sick
Permission:
We can use the verb "Can" and "Can't" to express permission to do a thing ( Normally we use it in the questions ).
For example:
Can I go to the bathroom?
Can I go to the playground?
MUST/MUSTN'T
Normally in the afirmative form this verb express a strong responability and necessity. Because "must" means "deure"
For example:
You must use the diskette
But in the negative form this verb has another meaning, because it means "Prohibition".
For example
You mustn't use the phone
HAVE TO/DON'T HAVE TO
We use the verb "have to" to implicate what is necessary to do.
For example:
In the Great Britain, people have to drive on the left.
We use the verb "don't have to" to indicate that a thing isn't necessary to do.
For example:
We don't have to walk far to school.
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The modal verbs are different than the other verbs, because the modal verbs:
- Don't change with the 3rd singular person
- They need to be accompanied by another verb
- Don't use auxiliar verbs for their conjugations