could chirp
Regular verb: chirp - chirped- chirped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could chirp
you could chirp
she could chirp
we could chirp
you could chirp
they could chirp 	I could be chirping
you could be chirping
she could be chirping
we could be chirping
you could be chirping
they could be chirping	I could have chirped
you could have chirped
she could have chirped
we could have chirped
you could have chirped
they could have chirped	I could have been chirping
you could have been chirping
she could have been chirping
we could have been chirping
you could have been chirping
they could have been chirping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't chirp
you couldn't chirp
she couldn't chirp
we couldn't chirp
you couldn't chirp
they couldn't chirp 	I couldn't be chirping
you couldn't be chirping
she couldn't be chirping
we couldn't be chirping
you couldn't be chirping
they couldn't be chirping	I couldn't have chirped
you couldn't have chirped
she couldn't have chirped
we couldn't have chirped
you couldn't have chirped
they couldn't have chirped	I couldn't have been chirping
you couldn't have been chirping
she couldn't have been chirping
we couldn't have been chirping
you couldn't have been chirping
they couldn't have been chirping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I chirp?
could you chirp?
could she chirp?
could we chirp?
could you chirp?
could they chirp? 	could I be chirping?
could you be chirping?
could she be chirping?
could we be chirping?
could you be chirping?
could they be chirping? 	could I have chirped?
could you have chirped?
could she have chirped?
could we have chirped?
could you have chirped?
could they have chirped? 	could I have been chirping?
could you have been chirping?
could she have been chirping?
could we have been chirping?
could you have been chirping?
could they have been chirping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I chirp?
couldn't you chirp?
couldn't she chirp?
couldn't we chirp?
couldn't you chirp?
couldn't they chirp? 	couldn't I be chirping?
couldn't you be chirping?
couldn't she be chirping?
couldn't we be chirping?
couldn't you be chirping?
couldn't they be chirping? 	couldn't I have chirped?
couldn't you have chirped?
couldn't she have chirped?
couldn't we have chirped?
couldn't you have chirped?
couldn't they have chirped? 	couldn't I have been chirping?
couldn't you have been chirping?
couldn't she have been chirping?
couldn't we have been chirping?
couldn't you have been chirping?
couldn't they have been chirping?