We are going to look at "be able to".
What to remember about this phrase?
1. It is not a modal verb.
2. It is simply the verb be plus an adjective (able) followed by the infinitive.
3. We can sometimes use it instead of can and could.
What do we use "be able to" for?
> To talk about ability.

The basic structure of "be able to" = subject + main verb (be) + adjective (able) + to-infinitive.
Example sentences:
Positive sentence = I am able to exercise.
Negative sentence = I am not able to exercise.
Question sentence = Will I be able to exercise?

"Be able to" is possible in all tenses:
I was able to exercise.
I will be able to exercise.
I have been able to exercise.

To find out more about the use of "be able to", join one of our grammar lessons taught by one of our amazing teachers.