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 couldn't mothproof you couldn't mothproof he couldn't mothproof we couldn't mothproof you couldn't mothproof they couldn't mothproof
V-ing form
I couldn't be mothproofing you couldn't be mothproofing he couldn't be mothproofing we couldn't be mothproofing you couldn't be mothproofing they couldn't be mothproofing
Perfect
I couldn't have mothproofed you couldn't have mothproofed he couldn't have mothproofed we couldn't have mothproofed you couldn't have mothproofed they couldn't have mothproofed
V-ing perfect
I couldn't have been mothproofing you couldn't have been mothproofing he couldn't have been mothproofing we couldn't have been mothproofing you couldn't have been mothproofing they couldn't 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
couldn't I mothproof? couldn't you mothproof? couldn't he mothproof? couldn't we mothproof? couldn't you mothproof? couldn't they mothproof?
V-ing form
couldn't I be mothproofing? couldn't you be mothproofing? couldn't he be mothproofing? couldn't we be mothproofing? couldn't you be mothproofing? couldn't they be mothproofing?
Perfect
couldn't I have mothproofed? couldn't you have mothproofed? couldn't he have mothproofed? couldn't we have mothproofed? couldn't you have mothproofed? couldn't they have mothproofed?
V-ing perfect
couldn't I have been mothproofing? couldn't you have been mothproofing? couldn't he have been mothproofing? couldn't we have been mothproofing? couldn't you have been mothproofing? couldn't they have been mothproofing?