English verb conjugation
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Regular verb: study - studied - studied

Affirmation

Simple form	V-ing form
I must study you must study he must study we must study you must study they must study	I must be studying you must be studying he 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 he 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 he 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 he 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 he 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 he 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 he 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 he study? must we study? must you study? must they study?	must I be studying? must you be studying? must he 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 he 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 he 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 he 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 he 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 he 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 he not have been studying? must we not have been studying? must you not have been studying? must they not have been studying?