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Publicado: 25 de octubre de 2012
Can and could are modal verbs. They are used with other verbs to convey ideas such as possibility, permission, etc.
We use can to:
talk about possibility and ability;
Example: I can ride ahorse. / He can speak three languages.
make requests or give orders;
Example: Can you buy me a can of beer. / Can you complete now what you are doing.
ask for or give permission.
Example: Can Icome in now?
We use can for the present. We also use it for the future when we decide we are able to do something.
Example: We can go swimming tomorrow.
We do not use can withinfinitive verb.
Example: We can play football today. NOT: We can to play football today.
Sometimes it is necessary to use (be) able to in place of can.
Example: I can’t contact him./ I haven’t been able to contact him for two days. (It is not possible to use can with present perfect tense).
Could is one of the modal verbs. We use could:
as the past tense of can.
Example:Jane said she could get the tickets for us .
to show what was possible in the past.
Example: He could cycle when he was four years old.
to ask someone to do something.
Example: Could you buysome cigarettes for me?
to ask if someone is able or allowed to do something.
Example: My grandmother could speak Spanish. / Could I ask you a question?
Where the subject is singular,we do not add –s to the verb
Example: He can swim. NOT: He can swims.
We use could for actions now or in the future.
Example: It’s a nice day. We could go for a walk.
Example: When I go toLondon next week, I could stay with my uncle.
Could is less sure than can, so we use could when we do not really mean what we say.
Example: I am so hungry. I could eat thewhole chicken. (NOT: I can eat the whole chicken).
We use could do for now and could have for the past.
Example: I am so tired. I could sleep the whole day. (now)
Example: I...
We use can to:
talk about possibility and ability;
Example: I can ride ahorse. / He can speak three languages.
make requests or give orders;
Example: Can you buy me a can of beer. / Can you complete now what you are doing.
ask for or give permission.
Example: Can Icome in now?
We use can for the present. We also use it for the future when we decide we are able to do something.
Example: We can go swimming tomorrow.
We do not use can withinfinitive verb.
Example: We can play football today. NOT: We can to play football today.
Sometimes it is necessary to use (be) able to in place of can.
Example: I can’t contact him./ I haven’t been able to contact him for two days. (It is not possible to use can with present perfect tense).
Could is one of the modal verbs. We use could:
as the past tense of can.
Example:Jane said she could get the tickets for us .
to show what was possible in the past.
Example: He could cycle when he was four years old.
to ask someone to do something.
Example: Could you buysome cigarettes for me?
to ask if someone is able or allowed to do something.
Example: My grandmother could speak Spanish. / Could I ask you a question?
Where the subject is singular,we do not add –s to the verb
Example: He can swim. NOT: He can swims.
We use could for actions now or in the future.
Example: It’s a nice day. We could go for a walk.
Example: When I go toLondon next week, I could stay with my uncle.
Could is less sure than can, so we use could when we do not really mean what we say.
Example: I am so hungry. I could eat thewhole chicken. (NOT: I can eat the whole chicken).
We use could do for now and could have for the past.
Example: I am so tired. I could sleep the whole day. (now)
Example: I...
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