English verb conjugation
COULD MOTHBALL

Regular verb: mothball - mothballed - mothballed

Affirmation

Simple form	V-ing form
I could mothball you could mothball he could mothball we could mothball you could mothball they could mothball	I could be mothballing you could be mothballing he 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 he 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 he 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 couldn't mothball you couldn't mothball he couldn't mothball we couldn't mothball you couldn't mothball they couldn't mothball	I couldn't be mothballing you couldn't be mothballing he couldn't be mothballing we couldn't be mothballing you couldn't be mothballing they couldn't be mothballing
Perfect	V-ing perfect
I couldn't have mothballed you couldn't have mothballed he couldn't have mothballed we couldn't have mothballed you couldn't have mothballed they couldn't have mothballed	I couldn't have been mothballing you couldn't have been mothballing he couldn't have been mothballing we couldn't have been mothballing you couldn't have been mothballing they couldn't have been mothballing

Interrogative form

Simple form	V-ing form
could I mothball? could you mothball? could he mothball? could we mothball? could you mothball? could they mothball?	could I be mothballing? could you be mothballing? could he 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 he 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 he 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
couldn't I mothball? couldn't you mothball? couldn't he mothball? couldn't we mothball? couldn't you mothball? couldn't they mothball?	couldn't I be mothballing? couldn't you be mothballing? couldn't he be mothballing? couldn't we be mothballing? couldn't you be mothballing? couldn't they be mothballing?
Perfect	V-ing perfect
couldn't I have mothballed? couldn't you have mothballed? couldn't he have mothballed? couldn't we have mothballed? couldn't you have mothballed? couldn't they have mothballed?	couldn't I have been mothballing? couldn't you have been mothballing? couldn't he have been mothballing? couldn't we have been mothballing? couldn't you have been mothballing? couldn't they have been mothballing?