could perfect
Regular verb: perfect - perfected- perfected

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could perfect
you could perfect
he could perfect
we could perfect
you could perfect
they could perfect 	I could be perfecting
you could be perfecting
he could be perfecting
we could be perfecting
you could be perfecting
they could be perfecting	I could have perfected
you could have perfected
he could have perfected
we could have perfected
you could have perfected
they could have perfected	I could have been perfecting
you could have been perfecting
he could have been perfecting
we could have been perfecting
you could have been perfecting
they could have been perfecting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't perfect
you couldn't perfect
he couldn't perfect
we couldn't perfect
you couldn't perfect
they couldn't perfect 	I couldn't be perfecting
you couldn't be perfecting
he couldn't be perfecting
we couldn't be perfecting
you couldn't be perfecting
they couldn't be perfecting	I couldn't have perfected
you couldn't have perfected
he couldn't have perfected
we couldn't have perfected
you couldn't have perfected
they couldn't have perfected	I couldn't have been perfecting
you couldn't have been perfecting
he couldn't have been perfecting
we couldn't have been perfecting
you couldn't have been perfecting
they couldn't have been perfecting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I perfect?
could you perfect?
could he perfect?
could we perfect?
could you perfect?
could they perfect? 	could I be perfecting?
could you be perfecting?
could he be perfecting?
could we be perfecting?
could you be perfecting?
could they be perfecting? 	could I have perfected?
could you have perfected?
could he have perfected?
could we have perfected?
could you have perfected?
could they have perfected? 	could I have been perfecting?
could you have been perfecting?
could he have been perfecting?
could we have been perfecting?
could you have been perfecting?
could they have been perfecting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I perfect?
couldn't you perfect?
couldn't he perfect?
couldn't we perfect?
couldn't you perfect?
couldn't they perfect? 	couldn't I be perfecting?
couldn't you be perfecting?
couldn't he be perfecting?
couldn't we be perfecting?
couldn't you be perfecting?
couldn't they be perfecting? 	couldn't I have perfected?
couldn't you have perfected?
couldn't he have perfected?
couldn't we have perfected?
couldn't you have perfected?
couldn't they have perfected? 	couldn't I have been perfecting?
couldn't you have been perfecting?
couldn't he have been perfecting?
couldn't we have been perfecting?
couldn't you have been perfecting?
couldn't they have been perfecting?