English verb conjugation
COULD PERFECT

Regular verb: perfect - perfected - perfected

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?