English verb conjugation
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Regular verb: study - studied - studied

Affirmation

Simple form	V-ing form
I must study you must study she must study we must study you must study they must study	I must be studying you must be studying she must be studying we must be studying you must be studying they must be studying
Perfect	V-ing perfect
I must have studied you must have studied she must have studied we must have studied you must have studied they must have studied	I must have been studying you must have been studying she must have been studying we must have been studying you must have been studying they must have been studying

Negation

Simple form	V-ing form
I must not study you must not study she must not study we must not study you must not study they must not study	I must not be studying you must not be studying she must not be studying we must not be studying you must not be studying they must not be studying
Perfect	V-ing perfect
I must not have studied you must not have studied she must not have studied we must not have studied you must not have studied they must not have studied	I must not have been studying you must not have been studying she must not have been studying we must not have been studying you must not have been studying they must not have been studying

Interrogative form

Simple form	V-ing form
must I study? must you study? must she study? must we study? must you study? must they study?	must I be studying? must you be studying? must she be studying? must we be studying? must you be studying? must they be studying?
Perfect	V-ing perfect
must I have studied? must you have studied? must she have studied? must we have studied? must you have studied? must they have studied?	must I have been studying? must you have been studying? must she have been studying? must we have been studying? must you have been studying? must they have been studying?

Interro-negative form

Simple form	V-ing form
must I not study? must you not study? must she not study? must we not study? must you not study? must they not study?	must I not be studying? must you not be studying? must she not be studying? must we not be studying? must you not be studying? must they not be studying?
Perfect	V-ing perfect
must I not have studied? must you not have studied? must she not have studied? must we not have studied? must you not have studied? must they not have studied?	must I not have been studying? must you not have been studying? must she not have been studying? must we not have been studying? must you not have been studying? must they not have been studying?