MSI 105 – How to use CAN, COULD and TO BE ABLE – Melhore Seu Inglês – Improve Your English PODCAST – Erika and Newton Skype Classes #eslpodcast

Hello everyone! In this MELHORE SEU INGLÊS – IMPROVE YOUR ENGLISH PODCAST, I will talk about how to use COULD, CAN and TO BE ABLE!


can, could, be able to

can and could are modal auxiliary verbs. be able to is NOT an auxiliary verb (it uses the verb be as a main verb). We include be able to here for convenience.

In this lesson we look at cancould and be able to, followed by a quiz to check your understanding.

can

Can is an auxiliary verb, a modal auxiliary verb. We use can to:

  • talk about possibility and ability
  • make requests
  • ask for or give permission

Structure of can

The basic structure for can is:

subject + auxiliary verb
can
+ main verb

The main verb is always the bare infinitive (infinitive without to).

subject auxiliary verb
can
main verb
+ I can play tennis.
He cannot play tennis.
can’t
? Can you play tennis?

Notice that:

  • Can is invariable. There is only one form: can
  • The main verb is always the bare infinitive.
The main verb is always the bare infinitive (infinitive without to). We cannot say: I can to play tennis.

Use of can

can for possibility and ability

We use can to talk about what is possible, what we are able or free to do:

  • She can drive a car.
  • John can speak Spanish.
  • cannot hear you. (I can’t hear you.)
  • Can you hear me?

Normally, we use can for the present. But it is possible to use can when we make present decisions about future ability.

  1. Can you help me with my homework? (present)
  2. Sorry. I’m busy today. But I can help you tomorrow. (future)

can for requests and orders

We often use can in a question to ask somebody to do something. This is not a real question – we do not really want to know if the person is able to do something, we want them to do it! The use of can in this way is informal (mainly between friends and family):

  • Can you make a cup of coffee, please.
  • Can you put the TV on.
  • Can you come here a minute.
  • Can you be quiet!

can for permission

We sometimes use can to ask or give permission for something:

  1. Can I smoke in this room?
  2. You can’t smoke here, but you can smoke in the garden.

(Note that we also use could, may, might for permission. The use of can for permission is informal.)

could

Could is an auxiliary verb, a modal auxiliary verb. We use could to:

  • talk about past possibility or ability
  • make requests

Structure of could

subject + auxiliary verb
could
+ main verb

The main verb is always the bare infinitive (infinitive without to).

subject auxiliary verb
could
main verb
+ My grandmother could swim.
She could not walk.
couldn’t
? Could your grandmother swim?

Notice that:

  • Could is invariable. There is only one form: could
  • The main verb is always the bare infinitive.
The main verb is always the bare infinitive (infinitive without to). We cannot say: I could to play tennis.

Use of could

could for past possibility or ability

We use could to talk about what was possible in the past, what we were able or free to do:

  • could swim when I was 5 years old.
  • My grandmother could speak seven languages.
  • When we arrived home, we could not open the door. (…couldn’t open the door.)
  • Could you understand what he was saying?

We use I (positive) and couldn’t (negative) for general ability in the past. But when we talk about one special occasion in the past, we use be able to (positive) and couldn’t (negative). Look at these examples:

past
general specific occasion
+ My grandmother could speak Spanish. A man fell into the river yesterday. The police were able to save him.
My grandmother couldn’t speak Spanish. A man fell into the river yesterday. The police couldn’t save him.

could for requests

We often use could in a question to ask somebody to do something. The use of could in this way is fairly polite (formal):

  • Could you tell me where the bank is, please?
  • Could you send me a catalogue, please?

be able to

Although we look at be able to here, it is not a modal verb. It is simply the verb be plus an adjective (able) followed by the infinitive. We look at be able to here because we sometimes use it instead of can and could.

We use be able to:

  • to talk about ability

Structure of be able to

The basic structure for be able to is:

subject + be + able + to-infinitive
subject main verb
be
adjective
able
to-infinitive
+ I am able to drive.
She is not able to drive.
isn’t
? Are you able to drive?

Notice that be able to is possible in all tenses, for example:

  • was able to drive…
  • will be able to drive…
  • have been able to drive…

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