English verb conjugation
CAN DRUM

Regular verb: drum - drummed - drummed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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