English verb conjugation
COULD DRUM

Regular verb: drum - drummed - drummed

Affirmation

Simple form	V-ing form
I could drum you could drum she could drum we could drum you could drum they could drum	I could be drumming you could be drumming she 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 she 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 she 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 she 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 she 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 she 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 she 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 she drum? could we drum? could you drum? could they drum?	could I be drumming? could you be drumming? could she 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 she 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 she 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 she 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 she 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 she 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 she have been drumming? couldn't we have been drumming? couldn't you have been drumming? couldn't they have been drumming?