2. Be able to
3.couldn't
4.could
5.can/be able to
6.can/can't
7.can't/be able to
8.be able to/can't
9.couldn't
10.could
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Answers & Comments
2. Be able to
3.couldn't
4.could
5.can/be able to
6.can/can't
7.can't/be able to
8.be able to/can't
9.couldn't
10.could