can research
Regular verb: research - researched- researched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can research
you can research
he can research
we can research
you can research
they can research 	I can be researching
you can be researching
he can be researching
we can be researching
you can be researching
they can be researching	I can have researched
you can have researched
he can have researched
we can have researched
you can have researched
they can have researched	I can have been researching
you can have been researching
he can have been researching
we can have been researching
you can have been researching
they can have been researching	

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

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

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