In many cases, we can use either can or be able to. Note that can is more usual. In some situations can/could is not possible. For example, we cannot use can after another auxiliary verb.
Fill in the blanks with can or be able to,
1I ............... see something over there.
Wrong!
2I ............... solve this puzzle.
Wrong!
3She ............... get the promotion.
Wrong!
4He ............... speak six languages.
Wrong!
5She will ............... help us.
Wrong!
We cannot use can with another auxiliary verb.
6I have ............... get over that trauma.
Wrong!
7He ............... finish first.
Wrong!
8They might ............... win.
Wrong!
9The applicant must ............... converse fluently in English.
Wrong!
10The fire spread rapidly but luckily we ............... escape.
Wrong!
We do not use could to say that we managed to do something on one occasion.
11She played well but she ............... win
Wrong!
We can use either could not or was not able to to say that we could not manage to do something on one occasion.
12I used ............... run miles on end.
Wrong!
Done.
Score: 0/12
Answers
- I Either could be used here see something over there.
- I Either could be used here solve this puzzle.
- She Either could be used here get the promotion.
- He Either could be used here speak six languages.
- She will be able to help us.
- I have not been able to get over that trauma.
- He Either could be used here finish first.
- They might be able to win.
- The applicant must be able to converse fluently in English.
- The fire spread rapidly but luckily we were able to escape.
- She played well but she Either could be used here win
- I used to be able to run miles on end.

