could purl
Verbo regular: purl - purled- purled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could purl
you could purl
he could purl
we could purl
you could purl
they could purl 	I could be purling
you could be purling
he could be purling
we could be purling
you could be purling
they could be purling	I could have purled
you could have purled
he could have purled
we could have purled
you could have purled
they could have purled	I could have been purling
you could have been purling
he could have been purling
we could have been purling
you could have been purling
they could have been purling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't purl
you couldn't purl
he couldn't purl
we couldn't purl
you couldn't purl
they couldn't purl 	I couldn't be purling
you couldn't be purling
he couldn't be purling
we couldn't be purling
you couldn't be purling
they couldn't be purling	I couldn't have purled
you couldn't have purled
he couldn't have purled
we couldn't have purled
you couldn't have purled
they couldn't have purled	I couldn't have been purling
you couldn't have been purling
he couldn't have been purling
we couldn't have been purling
you couldn't have been purling
they couldn't have been purling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I purl?
could you purl?
could he purl?
could we purl?
could you purl?
could they purl? 	could I be purling?
could you be purling?
could he be purling?
could we be purling?
could you be purling?
could they be purling? 	could I have purled?
could you have purled?
could he have purled?
could we have purled?
could you have purled?
could they have purled? 	could I have been purling?
could you have been purling?
could he have been purling?
could we have been purling?
could you have been purling?
could they have been purling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I purl?
couldn't you purl?
couldn't he purl?
couldn't we purl?
couldn't you purl?
couldn't they purl? 	couldn't I be purling?
couldn't you be purling?
couldn't he be purling?
couldn't we be purling?
couldn't you be purling?
couldn't they be purling? 	couldn't I have purled?
couldn't you have purled?
couldn't he have purled?
couldn't we have purled?
couldn't you have purled?
couldn't they have purled? 	couldn't I have been purling?
couldn't you have been purling?
couldn't he have been purling?
couldn't we have been purling?
couldn't you have been purling?
couldn't they have been purling?