could peck
Verbo regular: peck - pecked- pecked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could peck
you could peck
he could peck
we could peck
you could peck
they could peck 	I could be pecking
you could be pecking
he could be pecking
we could be pecking
you could be pecking
they could be pecking	I could have pecked
you could have pecked
he could have pecked
we could have pecked
you could have pecked
they could have pecked	I could have been pecking
you could have been pecking
he could have been pecking
we could have been pecking
you could have been pecking
they could have been pecking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't peck
you couldn't peck
he couldn't peck
we couldn't peck
you couldn't peck
they couldn't peck 	I couldn't be pecking
you couldn't be pecking
he couldn't be pecking
we couldn't be pecking
you couldn't be pecking
they couldn't be pecking	I couldn't have pecked
you couldn't have pecked
he couldn't have pecked
we couldn't have pecked
you couldn't have pecked
they couldn't have pecked	I couldn't have been pecking
you couldn't have been pecking
he couldn't have been pecking
we couldn't have been pecking
you couldn't have been pecking
they couldn't have been pecking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I peck?
could you peck?
could he peck?
could we peck?
could you peck?
could they peck? 	could I be pecking?
could you be pecking?
could he be pecking?
could we be pecking?
could you be pecking?
could they be pecking? 	could I have pecked?
could you have pecked?
could he have pecked?
could we have pecked?
could you have pecked?
could they have pecked? 	could I have been pecking?
could you have been pecking?
could he have been pecking?
could we have been pecking?
could you have been pecking?
could they have been pecking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I peck?
couldn't you peck?
couldn't he peck?
couldn't we peck?
couldn't you peck?
couldn't they peck? 	couldn't I be pecking?
couldn't you be pecking?
couldn't he be pecking?
couldn't we be pecking?
couldn't you be pecking?
couldn't they be pecking? 	couldn't I have pecked?
couldn't you have pecked?
couldn't he have pecked?
couldn't we have pecked?
couldn't you have pecked?
couldn't they have pecked? 	couldn't I have been pecking?
couldn't you have been pecking?
couldn't he have been pecking?
couldn't we have been pecking?
couldn't you have been pecking?
couldn't they have been pecking?