I can chirp you can chirp he can chirp we can chirp you can chirp they can chirp
V-ing form
I can be chirping you can be chirping he can be chirping we can be chirping you can be chirping they can be chirping
Perfect
I can have chirped you can have chirped he can have chirped we can have chirped you can have chirped they can have chirped
V-ing perfect
I can have been chirping you can have been chirping he can have been chirping we can have been chirping you can have been chirping they can have been chirping
Negation
Simple form
I cannot chirp you cannot chirp he cannot chirp we cannot chirp you cannot chirp they cannot chirp
V-ing form
I cannot be chirping you cannot be chirping he cannot be chirping we cannot be chirping you cannot be chirping they cannot be chirping
Perfect
I cannot have chirped you cannot have chirped he cannot have chirped we cannot have chirped you cannot have chirped they cannot have chirped
V-ing perfect
I cannot have been chirping you cannot have been chirping he cannot have been chirping we cannot have been chirping you cannot have been chirping they cannot have been chirping
Interrogative form
Simple form
can I chirp? can you chirp? can he chirp? can we chirp? can you chirp? can they chirp?
V-ing form
can I be chirping? can you be chirping? can he be chirping? can we be chirping? can you be chirping? can they be chirping?
Perfect
can I have chirped? can you have chirped? can he have chirped? can we have chirped? can you have chirped? can they have chirped?
V-ing perfect
can I have been chirping? can you have been chirping? can he have been chirping? can we have been chirping? can you have been chirping? can they have been chirping?
Interro-negative form
Simple form
can I not chirp? can you not chirp? can he not chirp? can we not chirp? can you not chirp? can they not chirp?
V-ing form
can I not be chirping? can you not be chirping? can he not be chirping? can we not be chirping? can you not be chirping? can they not be chirping?
Perfect
can I not have chirped? can you not have chirped? can he not have chirped? can we not have chirped? can you not have chirped? can they not have chirped?
V-ing perfect
can I not have been chirping? can you not have been chirping? can he not have been chirping? can we not have been chirping? can you not have been chirping? can they not have been chirping?