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 couldn't quakeproof you couldn't quakeproof he couldn't quakeproof we couldn't quakeproof you couldn't quakeproof they couldn't quakeproof	I couldn't be quakeproofing you couldn't be quakeproofing he couldn't be quakeproofing we couldn't be quakeproofing you couldn't be quakeproofing they couldn't be quakeproofing
Perfect	V-ing perfect
I couldn't have quakeproofed you couldn't have quakeproofed he couldn't have quakeproofed we couldn't have quakeproofed you couldn't have quakeproofed they couldn't have quakeproofed	I couldn't have been quakeproofing you couldn't have been quakeproofing he couldn't have been quakeproofing we couldn't have been quakeproofing you couldn't have been quakeproofing they couldn't 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
couldn't I quakeproof? couldn't you quakeproof? couldn't he quakeproof? couldn't we quakeproof? couldn't you quakeproof? couldn't they quakeproof?	couldn't I be quakeproofing? couldn't you be quakeproofing? couldn't he be quakeproofing? couldn't we be quakeproofing? couldn't you be quakeproofing? couldn't they be quakeproofing?
Perfect	V-ing perfect
couldn't I have quakeproofed? couldn't you have quakeproofed? couldn't he have quakeproofed? couldn't we have quakeproofed? couldn't you have quakeproofed? couldn't they have quakeproofed?	couldn't I have been quakeproofing? couldn't you have been quakeproofing? couldn't he have been quakeproofing? couldn't we have been quakeproofing? couldn't you have been quakeproofing? couldn't they have been quakeproofing?