should research
Regular verb: research - researched- researched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd research
you'd research
he'd research
we'd research
you'd research
they'd research 	I'd be researching
you'd be researching
he'd be researching
we'd be researching
you'd be researching
they'd be researching	I should've researched
you should've researched
he 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
he 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
he 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
he 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
he 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
he 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 he research?
should we research?
should you research?
should they research? 	should I be researching?
should you be researching?
should he be researching?
should we be researching?
should you be researching?
should they be researching? 	should I have researched?
should you have researched?
should he 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 he 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 he 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 he 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 he 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 he have been researching?
shouldn't we have been researching?
shouldn't you have been researching?
shouldn't they have been researching?