1.can
2.can't
3.been able to
4.be able to
5.couldn't
6.could
7.could
8.was able to
9.couldn't
10.was able to
11.could/was able to
12.can't,can
13.will be able to
1.can
2.can't
3.been able to
4.be able to
5.couldn't
6.could
7.could
8.was able to
9.couldn't
10.was able to
11.could/was able to
12.can't,can
13.will be able to