should research
Regular verb: research - researched- researched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd research
you'd research
she'd research
we'd research
you'd research
they'd research 	I'd be researching
you'd be researching
she'd be researching
we'd be researching
you'd be researching
they'd be researching	I should've researched
you should've researched
she should've researched
we should've researched
you should've researched
they should've researched	I should've been researching
you should've been researching
she should've been researching
we should've been researching
you should've been researching
they should've been researching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't research
you shouldn't research
she shouldn't research
we shouldn't research
you shouldn't research
they shouldn't research 	I shouldn't be researching
you shouldn't be researching
she shouldn't be researching
we shouldn't be researching
you shouldn't be researching
they shouldn't be researching	I shouldn't have researched
you shouldn't have researched
she shouldn't have researched
we shouldn't have researched
you shouldn't have researched
they shouldn't have researched	I shouldn't have been researching
you shouldn't have been researching
she shouldn't have been researching
we shouldn't have been researching
you shouldn't have been researching
they shouldn't have been researching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I research?
should you research?
should she research?
should we research?
should you research?
should they research? 	should I be researching?
should you be researching?
should she be researching?
should we be researching?
should you be researching?
should they be researching? 	should I have researched?
should you have researched?
should she have researched?
should we have researched?
should you have researched?
should they have researched? 	should I have been researching?
should you have been researching?
should she have been researching?
should we have been researching?
should you have been researching?
should they have been researching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I research?
shouldn't you research?
shouldn't she research?
shouldn't we research?
shouldn't you research?
shouldn't they research? 	shouldn't I be researching?
shouldn't you be researching?
shouldn't she be researching?
shouldn't we be researching?
shouldn't you be researching?
shouldn't they be researching? 	shouldn't I have researched?
shouldn't you have researched?
shouldn't she have researched?
shouldn't we have researched?
shouldn't you have researched?
shouldn't they have researched? 	shouldn't I have been researching?
shouldn't you have been researching?
shouldn't she have been researching?
shouldn't we have been researching?
shouldn't you have been researching?
shouldn't they have been researching?