English verb conjugation
MUST RESEARCH

Regular verb: research - researched - researched

Affirmation

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

Negation

Simple form	V-ing form
I must not research you must not research she must not research we must not research you must not research they must not research	I must not be researching you must not be researching she must not be researching we must not be researching you must not be researching they must not be researching
Perfect	V-ing perfect
I must not have researched you must not have researched she must not have researched we must not have researched you must not have researched they must not have researched	I must not have been researching you must not have been researching she must not have been researching we must not have been researching you must not have been researching they must not have been researching

Interrogative form

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

Interro-negative form

Simple form	V-ing form
must I not research? must you not research? must she not research? must we not research? must you not research? must they not research?	must I not be researching? must you not be researching? must she not be researching? must we not be researching? must you not be researching? must they not be researching?
Perfect	V-ing perfect
must I not have researched? must you not have researched? must she not have researched? must we not have researched? must you not have researched? must they not have researched?	must I not have been researching? must you not have been researching? must she not have been researching? must we not have been researching? must you not have been researching? must they not have been researching?