English verb conjugation
CAN STRUM

Regular verb: strum - strummed - strummed

Affirmation

Simple form	V-ing form
I can strum you can strum he can strum we can strum you can strum they can strum	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
can I strum? can you strum? can he strum? can we strum? can you strum? can they strum?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?