can strum
Regular verb: strum - strummed- strummed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can strum
you can strum
she can strum
we can strum
you can strum
they can strum 	I can be strumming
you can be strumming
she can be strumming
we can be strumming
you can be strumming
they can be strumming	I can have strummed
you can have strummed
she 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
she 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 	Perfect 	V-ing perfect 	
I can't strum
you can't strum
she 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
she can't be strumming
we can't be strumming
you can't be strumming
they can't be strumming	I can't have strummed
you can't have strummed
she 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
she 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 	Perfect 	V-ing perfect 	
can I strum?
can you strum?
can she strum?
can we strum?
can you strum?
can they strum? 	can I be strumming?
can you be strumming?
can she be strumming?
can we be strumming?
can you be strumming?
can they be strumming? 	can I have strummed?
can you have strummed?
can she 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 she 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 	Perfect 	V-ing perfect 	
can't I strum?
can't you strum?
can't she 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 she be strumming?
can't we be strumming?
can't you be strumming?
can't they be strumming? 	can't I have strummed?
can't you have strummed?
can't she 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 she have been strumming?
can't we have been strumming?
can't you have been strumming?
can't they have been strumming?