could chirp
Verbo regular: chirp - chirped- chirped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could chirp
you could chirp
he could chirp
we could chirp
you could chirp
they could chirp 	I could be chirping
you could be chirping
he could be chirping
we could be chirping
you could be chirping
they could be chirping	I could have chirped
you could have chirped
he 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
he could have been chirping
we could have been chirping
you could have been chirping
they could have been chirping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't chirp
you couldn't chirp
he 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
he 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
he 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
he couldn't have been chirping
we couldn't have been chirping
you couldn't have been chirping
they couldn't have been chirping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I chirp?
could you chirp?
could he chirp?
could we chirp?
could you chirp?
could they chirp? 	could I be chirping?
could you be chirping?
could he be chirping?
could we be chirping?
could you be chirping?
could they be chirping? 	could I have chirped?
could you have chirped?
could he 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 he have been chirping?
could we have been chirping?
could you have been chirping?
could they have been chirping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I chirp?
couldn't you chirp?
couldn't he 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 he 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 he 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 he have been chirping?
couldn't we have been chirping?
couldn't you have been chirping?
couldn't they have been chirping?