English verb conjugation
COULD DRUM

Regular verb: drum - drummed - drummed

Affirmation

Simple form	V-ing form
I could drum you could drum he could drum we could drum you could drum they could drum	I could be drumming you could be drumming he could be drumming we could be drumming you could be drumming they could be drumming
Perfect	V-ing perfect
I could have drummed you could have drummed he could have drummed we could have drummed you could have drummed they could have drummed	I could have been drumming you could have been drumming he could have been drumming we could have been drumming you could have been drumming they could have been drumming

Negation

Simple form	V-ing form
I couldn't drum you couldn't drum he couldn't drum we couldn't drum you couldn't drum they couldn't drum	I couldn't be drumming you couldn't be drumming he couldn't be drumming we couldn't be drumming you couldn't be drumming they couldn't be drumming
Perfect	V-ing perfect
I couldn't have drummed you couldn't have drummed he couldn't have drummed we couldn't have drummed you couldn't have drummed they couldn't have drummed	I couldn't have been drumming you couldn't have been drumming he couldn't have been drumming we couldn't have been drumming you couldn't have been drumming they couldn't have been drumming

Interrogative form

Simple form	V-ing form
could I drum? could you drum? could he drum? could we drum? could you drum? could they drum?	could I be drumming? could you be drumming? could he be drumming? could we be drumming? could you be drumming? could they be drumming?
Perfect	V-ing perfect
could I have drummed? could you have drummed? could he have drummed? could we have drummed? could you have drummed? could they have drummed?	could I have been drumming? could you have been drumming? could he have been drumming? could we have been drumming? could you have been drumming? could they have been drumming?

Interro-negative form

Simple form	V-ing form
couldn't I drum? couldn't you drum? couldn't he drum? couldn't we drum? couldn't you drum? couldn't they drum?	couldn't I be drumming? couldn't you be drumming? couldn't he be drumming? couldn't we be drumming? couldn't you be drumming? couldn't they be drumming?
Perfect	V-ing perfect
couldn't I have drummed? couldn't you have drummed? couldn't he have drummed? couldn't we have drummed? couldn't you have drummed? couldn't they have drummed?	couldn't I have been drumming? couldn't you have been drumming? couldn't he have been drumming? couldn't we have been drumming? couldn't you have been drumming? couldn't they have been drumming?