English verb conjugation
CAN RESEARCH

Regular verb: research - researched - researched

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?