I can strum you can strum he can strum we can strum you can strum they can strum
V-ing form
I can be strumming you can be strumming he can be strumming we can be strumming you can be strumming they can be strumming
Perfect
I can have strummed you can have strummed he can have strummed we can have strummed you can have strummed they can have strummed
V-ing perfect
I can have been strumming you can have been strumming he can have been strumming we can have been strumming you can have been strumming they can have been strumming
Negation
Simple form
I can't strum you can't strum he can't strum we can't strum you can't strum they can't strum
V-ing form
I can't be strumming you can't be strumming he can't be strumming we can't be strumming you can't be strumming they can't be strumming
Perfect
I can't have strummed you can't have strummed he can't have strummed we can't have strummed you can't have strummed they can't have strummed
V-ing perfect
I can't have been strumming you can't have been strumming he can't have been strumming we can't have been strumming you can't have been strumming they can't have been strumming
Interrogative form
Simple form
can I strum? can you strum? can he strum? can we strum? can you strum? can they strum?
V-ing form
can I be strumming? can you be strumming? can he be strumming? can we be strumming? can you be strumming? can they be strumming?
Perfect
can I have strummed? can you have strummed? can he have strummed? can we have strummed? can you have strummed? can they have strummed?
V-ing perfect
can I have been strumming? can you have been strumming? can he have been strumming? can we have been strumming? can you have been strumming? can they have been strumming?
Interro-negative form
Simple form
can't I strum? can't you strum? can't he strum? can't we strum? can't you strum? can't they strum?
V-ing form
can't I be strumming? can't you be strumming? can't he be strumming? can't we be strumming? can't you be strumming? can't they be strumming?
Perfect
can't I have strummed? can't you have strummed? can't he have strummed? can't we have strummed? can't you have strummed? can't they have strummed?
V-ing perfect
can't I have been strumming? can't you have been strumming? can't he have been strumming? can't we have been strumming? can't you have been strumming? can't they have been strumming?