English verb conjugation
CAN CHIRRUP

Regular verb: chirrup - chirruped - chirruped

Affirmation

Simple form	V-ing form
I can chirrup you can chirrup he can chirrup we can chirrup you can chirrup they can chirrup	I can be chirruping you can be chirruping he can be chirruping we can be chirruping you can be chirruping they can be chirruping
Perfect	V-ing perfect
I can have chirruped you can have chirruped he can have chirruped we can have chirruped you can have chirruped they can have chirruped	I can have been chirruping you can have been chirruping he can have been chirruping we can have been chirruping you can have been chirruping they can have been chirruping

Negation

Simple form	V-ing form
I cannot chirrup you cannot chirrup he cannot chirrup we cannot chirrup you cannot chirrup they cannot chirrup	I cannot be chirruping you cannot be chirruping he cannot be chirruping we cannot be chirruping you cannot be chirruping they cannot be chirruping
Perfect	V-ing perfect
I cannot have chirruped you cannot have chirruped he cannot have chirruped we cannot have chirruped you cannot have chirruped they cannot have chirruped	I cannot have been chirruping you cannot have been chirruping he cannot have been chirruping we cannot have been chirruping you cannot have been chirruping they cannot have been chirruping

Interrogative form

Simple form	V-ing form
can I chirrup? can you chirrup? can he chirrup? can we chirrup? can you chirrup? can they chirrup?	can I be chirruping? can you be chirruping? can he be chirruping? can we be chirruping? can you be chirruping? can they be chirruping?
Perfect	V-ing perfect
can I have chirruped? can you have chirruped? can he have chirruped? can we have chirruped? can you have chirruped? can they have chirruped?	can I have been chirruping? can you have been chirruping? can he have been chirruping? can we have been chirruping? can you have been chirruping? can they have been chirruping?

Interro-negative form

Simple form	V-ing form
can I not chirrup? can you not chirrup? can he not chirrup? can we not chirrup? can you not chirrup? can they not chirrup?	can I not be chirruping? can you not be chirruping? can he not be chirruping? can we not be chirruping? can you not be chirruping? can they not be chirruping?
Perfect	V-ing perfect
can I not have chirruped? can you not have chirruped? can he not have chirruped? can we not have chirruped? can you not have chirruped? can they not have chirruped?	can I not have been chirruping? can you not have been chirruping? can he not have been chirruping? can we not have been chirruping? can you not have been chirruping? can they not have been chirruping?