should strum
Regular verb: strum - strummed- strummed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd strum
you'd strum
he'd strum
we'd strum
you'd strum
they'd strum 	I'd be strumming
you'd be strumming
he'd be strumming
we'd be strumming
you'd be strumming
they'd be strumming	I should've strummed
you should've strummed
he should've strummed
we should've strummed
you should've strummed
they should've strummed	I should've been strumming
you should've been strumming
he should've been strumming
we should've been strumming
you should've been strumming
they should've been strumming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't strum
you shouldn't strum
he shouldn't strum
we shouldn't strum
you shouldn't strum
they shouldn't strum 	I shouldn't be strumming
you shouldn't be strumming
he shouldn't be strumming
we shouldn't be strumming
you shouldn't be strumming
they shouldn't be strumming	I shouldn't have strummed
you shouldn't have strummed
he shouldn't have strummed
we shouldn't have strummed
you shouldn't have strummed
they shouldn't have strummed	I shouldn't have been strumming
you shouldn't have been strumming
he shouldn't have been strumming
we shouldn't have been strumming
you shouldn't have been strumming
they shouldn't have been strumming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I strum?
should you strum?
should he strum?
should we strum?
should you strum?
should they strum? 	should I be strumming?
should you be strumming?
should he be strumming?
should we be strumming?
should you be strumming?
should they be strumming? 	should I have strummed?
should you have strummed?
should he have strummed?
should we have strummed?
should you have strummed?
should they have strummed? 	should I have been strumming?
should you have been strumming?
should he have been strumming?
should we have been strumming?
should you have been strumming?
should they have been strumming? 	

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