I can fly you can fly he can fly we can fly you can fly they can fly
V-ing form
I can be flying you can be flying he can be flying we can be flying you can be flying they can be flying
Perfect
I can have flown you can have flown he can have flown we can have flown you can have flown they can have flown
V-ing perfect
I can have been flying you can have been flying he can have been flying we can have been flying you can have been flying they can have been flying
Negation
Simple form
I cannot fly you cannot fly he cannot fly we cannot fly you cannot fly they cannot fly
V-ing form
I cannot be flying you cannot be flying he cannot be flying we cannot be flying you cannot be flying they cannot be flying
Perfect
I cannot have flown you cannot have flown he cannot have flown we cannot have flown you cannot have flown they cannot have flown
V-ing perfect
I cannot have been flying you cannot have been flying he cannot have been flying we cannot have been flying you cannot have been flying they cannot have been flying
Interrogative form
Simple form
can I fly? can you fly? can he fly? can we fly? can you fly? can they fly?
V-ing form
can I be flying? can you be flying? can he be flying? can we be flying? can you be flying? can they be flying?
Perfect
can I have flown? can you have flown? can he have flown? can we have flown? can you have flown? can they have flown?
V-ing perfect
can I have been flying? can you have been flying? can he have been flying? can we have been flying? can you have been flying? can they have been flying?
Interro-negative form
Simple form
can I not fly? can you not fly? can he not fly? can we not fly? can you not fly? can they not fly?
V-ing form
can I not be flying? can you not be flying? can he not be flying? can we not be flying? can you not be flying? can they not be flying?
Perfect
can I not have flown? can you not have flown? can he not have flown? can we not have flown? can you not have flown? can they not have flown?
V-ing perfect
can I not have been flying? can you not have been flying? can he not have been flying? can we not have been flying? can you not have been flying? can they not have been flying?