I could quakeproof you could quakeproof he could quakeproof we could quakeproof you could quakeproof they could quakeproof
V-ing form
I could be quakeproofing you could be quakeproofing he could be quakeproofing we could be quakeproofing you could be quakeproofing they could be quakeproofing
Perfect
I could have quakeproofed you could have quakeproofed he could have quakeproofed we could have quakeproofed you could have quakeproofed they could have quakeproofed
V-ing perfect
I could have been quakeproofing you could have been quakeproofing he could have been quakeproofing we could have been quakeproofing you could have been quakeproofing they could have been quakeproofing
Negation
Simple form
I could not quakeproof you could not quakeproof he could not quakeproof we could not quakeproof you could not quakeproof they could not quakeproof
V-ing form
I could not be quakeproofing you could not be quakeproofing he could not be quakeproofing we could not be quakeproofing you could not be quakeproofing they could not be quakeproofing
Perfect
I could not have quakeproofed you could not have quakeproofed he could not have quakeproofed we could not have quakeproofed you could not have quakeproofed they could not have quakeproofed
V-ing perfect
I could not have been quakeproofing you could not have been quakeproofing he could not have been quakeproofing we could not have been quakeproofing you could not have been quakeproofing they could not have been quakeproofing
Interrogative form
Simple form
could I quakeproof? could you quakeproof? could he quakeproof? could we quakeproof? could you quakeproof? could they quakeproof?
V-ing form
could I be quakeproofing? could you be quakeproofing? could he be quakeproofing? could we be quakeproofing? could you be quakeproofing? could they be quakeproofing?
Perfect
could I have quakeproofed? could you have quakeproofed? could he have quakeproofed? could we have quakeproofed? could you have quakeproofed? could they have quakeproofed?
V-ing perfect
could I have been quakeproofing? could you have been quakeproofing? could he have been quakeproofing? could we have been quakeproofing? could you have been quakeproofing? could they have been quakeproofing?
Interro-negative form
Simple form
could I not quakeproof? could you not quakeproof? could he not quakeproof? could we not quakeproof? could you not quakeproof? could they not quakeproof?
V-ing form
could I not be quakeproofing? could you not be quakeproofing? could he not be quakeproofing? could we not be quakeproofing? could you not be quakeproofing? could they not be quakeproofing?
Perfect
could I not have quakeproofed? could you not have quakeproofed? could he not have quakeproofed? could we not have quakeproofed? could you not have quakeproofed? could they not have quakeproofed?
V-ing perfect
could I not have been quakeproofing? could you not have been quakeproofing? could he not have been quakeproofing? could we not have been quakeproofing? could you not have been quakeproofing? could they not have been quakeproofing?