I can correct you can correct he can correct we can correct you can correct they can correct
V-ing form
I can be correcting you can be correcting he can be correcting we can be correcting you can be correcting they can be correcting
Perfect
I can have corrected you can have corrected he can have corrected we can have corrected you can have corrected they can have corrected
V-ing perfect
I can have been correcting you can have been correcting he can have been correcting we can have been correcting you can have been correcting they can have been correcting
Negation
Simple form
I cannot correct you cannot correct he cannot correct we cannot correct you cannot correct they cannot correct
V-ing form
I cannot be correcting you cannot be correcting he cannot be correcting we cannot be correcting you cannot be correcting they cannot be correcting
Perfect
I cannot have corrected you cannot have corrected he cannot have corrected we cannot have corrected you cannot have corrected they cannot have corrected
V-ing perfect
I cannot have been correcting you cannot have been correcting he cannot have been correcting we cannot have been correcting you cannot have been correcting they cannot have been correcting
Interrogative form
Simple form
can I correct? can you correct? can he correct? can we correct? can you correct? can they correct?
V-ing form
can I be correcting? can you be correcting? can he be correcting? can we be correcting? can you be correcting? can they be correcting?
Perfect
can I have corrected? can you have corrected? can he have corrected? can we have corrected? can you have corrected? can they have corrected?
V-ing perfect
can I have been correcting? can you have been correcting? can he have been correcting? can we have been correcting? can you have been correcting? can they have been correcting?
Interro-negative form
Simple form
can I not correct? can you not correct? can he not correct? can we not correct? can you not correct? can they not correct?
V-ing form
can I not be correcting? can you not be correcting? can he not be correcting? can we not be correcting? can you not be correcting? can they not be correcting?
Perfect
can I not have corrected? can you not have corrected? can he not have corrected? can we not have corrected? can you not have corrected? can they not have corrected?
V-ing perfect
can I not have been correcting? can you not have been correcting? can he not have been correcting? can we not have been correcting? can you not have been correcting? can they not have been correcting?