English verb conjugation
COULD VACUUM

Regular verb: vacuum - vacuumed - vacuumed

Affirmation

Simple form	V-ing form
I could vacuum you could vacuum he could vacuum we could vacuum you could vacuum they could vacuum	I could be vacuuming you could be vacuuming he could be vacuuming we could be vacuuming you could be vacuuming they could be vacuuming
Perfect	V-ing perfect
I could have vacuumed you could have vacuumed he could have vacuumed we could have vacuumed you could have vacuumed they could have vacuumed	I could have been vacuuming you could have been vacuuming he could have been vacuuming we could have been vacuuming you could have been vacuuming they could have been vacuuming

Negation

Simple form	V-ing form
I could not vacuum you could not vacuum he could not vacuum we could not vacuum you could not vacuum they could not vacuum	I could not be vacuuming you could not be vacuuming he could not be vacuuming we could not be vacuuming you could not be vacuuming they could not be vacuuming
Perfect	V-ing perfect
I could not have vacuumed you could not have vacuumed he could not have vacuumed we could not have vacuumed you could not have vacuumed they could not have vacuumed	I could not have been vacuuming you could not have been vacuuming he could not have been vacuuming we could not have been vacuuming you could not have been vacuuming they could not have been vacuuming

Interrogative form

Simple form	V-ing form
could I vacuum? could you vacuum? could he vacuum? could we vacuum? could you vacuum? could they vacuum?	could I be vacuuming? could you be vacuuming? could he be vacuuming? could we be vacuuming? could you be vacuuming? could they be vacuuming?
Perfect	V-ing perfect
could I have vacuumed? could you have vacuumed? could he have vacuumed? could we have vacuumed? could you have vacuumed? could they have vacuumed?	could I have been vacuuming? could you have been vacuuming? could he have been vacuuming? could we have been vacuuming? could you have been vacuuming? could they have been vacuuming?

Interro-negative form

Simple form	V-ing form
could I not vacuum? could you not vacuum? could he not vacuum? could we not vacuum? could you not vacuum? could they not vacuum?	could I not be vacuuming? could you not be vacuuming? could he not be vacuuming? could we not be vacuuming? could you not be vacuuming? could they not be vacuuming?
Perfect	V-ing perfect
could I not have vacuumed? could you not have vacuumed? could he not have vacuumed? could we not have vacuumed? could you not have vacuumed? could they not have vacuumed?	could I not have been vacuuming? could you not have been vacuuming? could he not have been vacuuming? could we not have been vacuuming? could you not have been vacuuming? could they not have been vacuuming?