should assist
Regular verb: assist - assisted- assisted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd assist
you'd assist
he'd assist
we'd assist
you'd assist
they'd assist 	I'd be assisting
you'd be assisting
he'd be assisting
we'd be assisting
you'd be assisting
they'd be assisting	I should've assisted
you should've assisted
he should've assisted
we should've assisted
you should've assisted
they should've assisted	I should've been assisting
you should've been assisting
he should've been assisting
we should've been assisting
you should've been assisting
they should've been assisting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't assist
you shouldn't assist
he shouldn't assist
we shouldn't assist
you shouldn't assist
they shouldn't assist 	I shouldn't be assisting
you shouldn't be assisting
he shouldn't be assisting
we shouldn't be assisting
you shouldn't be assisting
they shouldn't be assisting	I shouldn't have assisted
you shouldn't have assisted
he shouldn't have assisted
we shouldn't have assisted
you shouldn't have assisted
they shouldn't have assisted	I shouldn't have been assisting
you shouldn't have been assisting
he shouldn't have been assisting
we shouldn't have been assisting
you shouldn't have been assisting
they shouldn't have been assisting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I assist?
should you assist?
should he assist?
should we assist?
should you assist?
should they assist? 	should I be assisting?
should you be assisting?
should he be assisting?
should we be assisting?
should you be assisting?
should they be assisting? 	should I have assisted?
should you have assisted?
should he have assisted?
should we have assisted?
should you have assisted?
should they have assisted? 	should I have been assisting?
should you have been assisting?
should he have been assisting?
should we have been assisting?
should you have been assisting?
should they have been assisting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I assist?
shouldn't you assist?
shouldn't he assist?
shouldn't we assist?
shouldn't you assist?
shouldn't they assist? 	shouldn't I be assisting?
shouldn't you be assisting?
shouldn't he be assisting?
shouldn't we be assisting?
shouldn't you be assisting?
shouldn't they be assisting? 	shouldn't I have assisted?
shouldn't you have assisted?
shouldn't he have assisted?
shouldn't we have assisted?
shouldn't you have assisted?
shouldn't they have assisted? 	shouldn't I have been assisting?
shouldn't you have been assisting?
shouldn't he have been assisting?
shouldn't we have been assisting?
shouldn't you have been assisting?
shouldn't they have been assisting?