I could mothproof you could mothproof he could mothproof we could mothproof you could mothproof they could mothproof
V-ing form
I could be mothproofing you could be mothproofing he could be mothproofing we could be mothproofing you could be mothproofing they could be mothproofing
Perfect
I could have mothproofed you could have mothproofed he could have mothproofed we could have mothproofed you could have mothproofed they could have mothproofed
V-ing perfect
I could have been mothproofing you could have been mothproofing he could have been mothproofing we could have been mothproofing you could have been mothproofing they could have been mothproofing
Negation
Simple form
I could not mothproof you could not mothproof he could not mothproof we could not mothproof you could not mothproof they could not mothproof
V-ing form
I could not be mothproofing you could not be mothproofing he could not be mothproofing we could not be mothproofing you could not be mothproofing they could not be mothproofing
Perfect
I could not have mothproofed you could not have mothproofed he could not have mothproofed we could not have mothproofed you could not have mothproofed they could not have mothproofed
V-ing perfect
I could not have been mothproofing you could not have been mothproofing he could not have been mothproofing we could not have been mothproofing you could not have been mothproofing they could not have been mothproofing
Interrogative form
Simple form
could I mothproof? could you mothproof? could he mothproof? could we mothproof? could you mothproof? could they mothproof?
V-ing form
could I be mothproofing? could you be mothproofing? could he be mothproofing? could we be mothproofing? could you be mothproofing? could they be mothproofing?
Perfect
could I have mothproofed? could you have mothproofed? could he have mothproofed? could we have mothproofed? could you have mothproofed? could they have mothproofed?
V-ing perfect
could I have been mothproofing? could you have been mothproofing? could he have been mothproofing? could we have been mothproofing? could you have been mothproofing? could they have been mothproofing?
Interro-negative form
Simple form
could I not mothproof? could you not mothproof? could he not mothproof? could we not mothproof? could you not mothproof? could they not mothproof?
V-ing form
could I not be mothproofing? could you not be mothproofing? could he not be mothproofing? could we not be mothproofing? could you not be mothproofing? could they not be mothproofing?
Perfect
could I not have mothproofed? could you not have mothproofed? could he not have mothproofed? could we not have mothproofed? could you not have mothproofed? could they not have mothproofed?
V-ing perfect
could I not have been mothproofing? could you not have been mothproofing? could he not have been mothproofing? could we not have been mothproofing? could you not have been mothproofing? could they not have been mothproofing?