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