English verb conjugation
COULD MOTHBALL

Regular verb: mothball - mothballed - mothballed

Affirmation

Simple form	V-ing form
I could mothball you could mothball she could mothball we could mothball you could mothball they could mothball	I could be mothballing you could be mothballing she could be mothballing we could be mothballing you could be mothballing they could be mothballing
Perfect	V-ing perfect
I could have mothballed you could have mothballed she could have mothballed we could have mothballed you could have mothballed they could have mothballed	I could have been mothballing you could have been mothballing she could have been mothballing we could have been mothballing you could have been mothballing they could have been mothballing

Negation

Simple form	V-ing form
I could not mothball you could not mothball she could not mothball we could not mothball you could not mothball they could not mothball	I could not be mothballing you could not be mothballing she could not be mothballing we could not be mothballing you could not be mothballing they could not be mothballing
Perfect	V-ing perfect
I could not have mothballed you could not have mothballed she could not have mothballed we could not have mothballed you could not have mothballed they could not have mothballed	I could not have been mothballing you could not have been mothballing she could not have been mothballing we could not have been mothballing you could not have been mothballing they could not have been mothballing

Interrogative form

Simple form	V-ing form
could I mothball? could you mothball? could she mothball? could we mothball? could you mothball? could they mothball?	could I be mothballing? could you be mothballing? could she be mothballing? could we be mothballing? could you be mothballing? could they be mothballing?
Perfect	V-ing perfect
could I have mothballed? could you have mothballed? could she have mothballed? could we have mothballed? could you have mothballed? could they have mothballed?	could I have been mothballing? could you have been mothballing? could she have been mothballing? could we have been mothballing? could you have been mothballing? could they have been mothballing?

Interro-negative form

Simple form	V-ing form
could I not mothball? could you not mothball? could she not mothball? could we not mothball? could you not mothball? could they not mothball?	could I not be mothballing? could you not be mothballing? could she not be mothballing? could we not be mothballing? could you not be mothballing? could they not be mothballing?
Perfect	V-ing perfect
could I not have mothballed? could you not have mothballed? could she not have mothballed? could we not have mothballed? could you not have mothballed? could they not have mothballed?	could I not have been mothballing? could you not have been mothballing? could she not have been mothballing? could we not have been mothballing? could you not have been mothballing? could they not have been mothballing?