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
