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