I can perfect you can perfect she can perfect we can perfect you can perfect they can perfect
V-ing form
I can be perfecting you can be perfecting she can be perfecting we can be perfecting you can be perfecting they can be perfecting
Perfect
I can have perfected you can have perfected she can have perfected we can have perfected you can have perfected they can have perfected
V-ing perfect
I can have been perfecting you can have been perfecting she can have been perfecting we can have been perfecting you can have been perfecting they can have been perfecting
Negation
Simple form
I cannot perfect you cannot perfect she cannot perfect we cannot perfect you cannot perfect they cannot perfect
V-ing form
I cannot be perfecting you cannot be perfecting she cannot be perfecting we cannot be perfecting you cannot be perfecting they cannot be perfecting
Perfect
I cannot have perfected you cannot have perfected she cannot have perfected we cannot have perfected you cannot have perfected they cannot have perfected
V-ing perfect
I cannot have been perfecting you cannot have been perfecting she cannot have been perfecting we cannot have been perfecting you cannot have been perfecting they cannot have been perfecting
Interrogative form
Simple form
can I perfect? can you perfect? can she perfect? can we perfect? can you perfect? can they perfect?
V-ing form
can I be perfecting? can you be perfecting? can she be perfecting? can we be perfecting? can you be perfecting? can they be perfecting?
Perfect
can I have perfected? can you have perfected? can she have perfected? can we have perfected? can you have perfected? can they have perfected?
V-ing perfect
can I have been perfecting? can you have been perfecting? can she have been perfecting? can we have been perfecting? can you have been perfecting? can they have been perfecting?
Interro-negative form
Simple form
can I not perfect? can you not perfect? can she not perfect? can we not perfect? can you not perfect? can they not perfect?
V-ing form
can I not be perfecting? can you not be perfecting? can she not be perfecting? can we not be perfecting? can you not be perfecting? can they not be perfecting?
Perfect
can I not have perfected? can you not have perfected? can she not have perfected? can we not have perfected? can you not have perfected? can they not have perfected?
V-ing perfect
can I not have been perfecting? can you not have been perfecting? can she not have been perfecting? can we not have been perfecting? can you not have been perfecting? can they not have been perfecting?