2. We use can to say that something is
possible, or that somebody has the
ability to do something. We use can
+ infinitive
Can
3. For examples:
1. We can see the lake from our bedroom window.
2. I haven’t got a pen. You can see mine
3. Can you speak any foreing languages?
4. I can come and see you tomorrow if you like.
The negative is can’t ( cannot)
1. I am afraid I can´t come to the party on Friday .
4. Could
Sometimes could is the past of can. We use could especially with:
See / hear / smell / taste / fell / remember / understand
1. We had a lovely room in the hotel. We could see the lake.
2. As soon as I walked into the room, I could smell gas.
3. I was sitting at the back of the theatre and couldn’t here very well.
We also use could to say that somebody had the general ability to do
something:
1. My grandfather could speak five languages.
2. We were totally free. We could do what we want.
5. Be able to for ability
We use be able to to express ability. "Able" is an adjective
meaning: having the power, skill or means to do something. If we
say "I am able to swim", it is like saying "I can swim". We
sometimes use be able to instead of "can" or "could" for ability.
we use be able to when we want to use other tenses or the
infinitive.
1. I have been able to swim since I was five. (present perfect)
2. You will be able to speak perfect English very soon. (future
simple)
3. I would like to be able to fly an airplane. (infinitive)
