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 couldn't vacuum you couldn't vacuum he couldn't vacuum we couldn't vacuum you couldn't vacuum they couldn't vacuum	I couldn't be vacuuming you couldn't be vacuuming he couldn't be vacuuming we couldn't be vacuuming you couldn't be vacuuming they couldn't be vacuuming
Perfect	V-ing perfect
I couldn't have vacuumed you couldn't have vacuumed he couldn't have vacuumed we couldn't have vacuumed you couldn't have vacuumed they couldn't have vacuumed	I couldn't have been vacuuming you couldn't have been vacuuming he couldn't have been vacuuming we couldn't have been vacuuming you couldn't have been vacuuming they couldn't 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
couldn't I vacuum? couldn't you vacuum? couldn't he vacuum? couldn't we vacuum? couldn't you vacuum? couldn't they vacuum?	couldn't I be vacuuming? couldn't you be vacuuming? couldn't he be vacuuming? couldn't we be vacuuming? couldn't you be vacuuming? couldn't they be vacuuming?
Perfect	V-ing perfect
couldn't I have vacuumed? couldn't you have vacuumed? couldn't he have vacuumed? couldn't we have vacuumed? couldn't you have vacuumed? couldn't they have vacuumed?	couldn't I have been vacuuming? couldn't you have been vacuuming? couldn't he have been vacuuming? couldn't we have been vacuuming? couldn't you have been vacuuming? couldn't they have been vacuuming?