I could forage you could forage she could forage we could forage you could forage they could forage
V-ing form
I could be foraging you could be foraging she could be foraging we could be foraging you could be foraging they could be foraging
Perfect
I could have foraged you could have foraged she could have foraged we could have foraged you could have foraged they could have foraged
V-ing perfect
I could have been foraging you could have been foraging she could have been foraging we could have been foraging you could have been foraging they could have been foraging
Negation
Simple form
I could not forage you could not forage she could not forage we could not forage you could not forage they could not forage
V-ing form
I could not be foraging you could not be foraging she could not be foraging we could not be foraging you could not be foraging they could not be foraging
Perfect
I could not have foraged you could not have foraged she could not have foraged we could not have foraged you could not have foraged they could not have foraged
V-ing perfect
I could not have been foraging you could not have been foraging she could not have been foraging we could not have been foraging you could not have been foraging they could not have been foraging
Interrogative form
Simple form
could I forage? could you forage? could she forage? could we forage? could you forage? could they forage?
V-ing form
could I be foraging? could you be foraging? could she be foraging? could we be foraging? could you be foraging? could they be foraging?
Perfect
could I have foraged? could you have foraged? could she have foraged? could we have foraged? could you have foraged? could they have foraged?
V-ing perfect
could I have been foraging? could you have been foraging? could she have been foraging? could we have been foraging? could you have been foraging? could they have been foraging?
Interro-negative form
Simple form
could I not forage? could you not forage? could she not forage? could we not forage? could you not forage? could they not forage?
V-ing form
could I not be foraging? could you not be foraging? could she not be foraging? could we not be foraging? could you not be foraging? could they not be foraging?
Perfect
could I not have foraged? could you not have foraged? could she not have foraged? could we not have foraged? could you not have foraged? could they not have foraged?
V-ing perfect
could I not have been foraging? could you not have been foraging? could she not have been foraging? could we not have been foraging? could you not have been foraging? could they not have been foraging?