I could corrode you could corrode he could corrode we could corrode you could corrode they could corrode
V-ing form
I could be corroding you could be corroding he could be corroding we could be corroding you could be corroding they could be corroding
Perfect
I could have corroded you could have corroded he could have corroded we could have corroded you could have corroded they could have corroded
V-ing perfect
I could have been corroding you could have been corroding he could have been corroding we could have been corroding you could have been corroding they could have been corroding
Negation
Simple form
I could not corrode you could not corrode he could not corrode we could not corrode you could not corrode they could not corrode
V-ing form
I could not be corroding you could not be corroding he could not be corroding we could not be corroding you could not be corroding they could not be corroding
Perfect
I could not have corroded you could not have corroded he could not have corroded we could not have corroded you could not have corroded they could not have corroded
V-ing perfect
I could not have been corroding you could not have been corroding he could not have been corroding we could not have been corroding you could not have been corroding they could not have been corroding
Interrogative form
Simple form
could I corrode? could you corrode? could he corrode? could we corrode? could you corrode? could they corrode?
V-ing form
could I be corroding? could you be corroding? could he be corroding? could we be corroding? could you be corroding? could they be corroding?
Perfect
could I have corroded? could you have corroded? could he have corroded? could we have corroded? could you have corroded? could they have corroded?
V-ing perfect
could I have been corroding? could you have been corroding? could he have been corroding? could we have been corroding? could you have been corroding? could they have been corroding?
Interro-negative form
Simple form
could I not corrode? could you not corrode? could he not corrode? could we not corrode? could you not corrode? could they not corrode?
V-ing form
could I not be corroding? could you not be corroding? could he not be corroding? could we not be corroding? could you not be corroding? could they not be corroding?
Perfect
could I not have corroded? could you not have corroded? could he not have corroded? could we not have corroded? could you not have corroded? could they not have corroded?
V-ing perfect
could I not have been corroding? could you not have been corroding? could he not have been corroding? could we not have been corroding? could you not have been corroding? could they not have been corroding?