could purfle
Regular verb: purfle - purfled- purfled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could purfle
you could purfle
he could purfle
we could purfle
you could purfle
they could purfle 	I could be purfling
you could be purfling
he could be purfling
we could be purfling
you could be purfling
they could be purfling	I could have purfled
you could have purfled
he could have purfled
we could have purfled
you could have purfled
they could have purfled	I could have been purfling
you could have been purfling
he could have been purfling
we could have been purfling
you could have been purfling
they could have been purfling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not purfle
you could not purfle
he could not purfle
we could not purfle
you could not purfle
they could not purfle 	I could not be purfling
you could not be purfling
he could not be purfling
we could not be purfling
you could not be purfling
they could not be purfling	I could not have purfled
you could not have purfled
he could not have purfled
we could not have purfled
you could not have purfled
they could not have purfled	I could not have been purfling
you could not have been purfling
he could not have been purfling
we could not have been purfling
you could not have been purfling
they could not have been purfling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I purfle?
could you purfle?
could he purfle?
could we purfle?
could you purfle?
could they purfle? 	could I be purfling?
could you be purfling?
could he be purfling?
could we be purfling?
could you be purfling?
could they be purfling? 	could I have purfled?
could you have purfled?
could he have purfled?
could we have purfled?
could you have purfled?
could they have purfled? 	could I have been purfling?
could you have been purfling?
could he have been purfling?
could we have been purfling?
could you have been purfling?
could they have been purfling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not purfle?
could you not purfle?
could he not purfle?
could we not purfle?
could you not purfle?
could they not purfle? 	could I not be purfling?
could you not be purfling?
could he not be purfling?
could we not be purfling?
could you not be purfling?
could they not be purfling? 	could I not have purfled?
could you not have purfled?
could he not have purfled?
could we not have purfled?
could you not have purfled?
could they not have purfled? 	could I not have been purfling?
could you not have been purfling?
could he not have been purfling?
could we not have been purfling?
could you not have been purfling?
could they not have been purfling?