Question

1- Put in 'can', 'can't', 'could' or 'couldn' t'

Answer 1

1) Could
2) Couldn’t
3) Can
4) Can
5)Couldn’t
6) Couldn’t
7) Could
8) Can’t
9) Couldn’t
10)Could

Answer 2

1. could  2. couldn't  3. could  4.can  5. couldn't     6. couldn't    7.  could   8.can't

9.couldn't  10. could

]In these sentences the verb "can" is used as ability.  Can and can't to express ability in tne present-.  Could and couldn't to express ability in the past.  There will be agreement of the verb can and the tense within the sentence and also its connotation