English verb conjugation
COULD QUAKEPROOF

Regular verb: quakeproof - quakeproofed - quakeproofed

Affirmation

Simple form	V-ing form
I could quakeproof you could quakeproof he could quakeproof we could quakeproof you could quakeproof they could quakeproof	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
could I quakeproof? could you quakeproof? could he quakeproof? could we quakeproof? could you quakeproof? could they quakeproof?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?