English verb conjugation
MUST TREPHINE

Regular verb: trephine - trephined - trephined

Affirmation

Simple form	V-ing form
I must trephine you must trephine he must trephine we must trephine you must trephine they must trephine	I must be trephining you must be trephining he must be trephining we must be trephining you must be trephining they must be trephining
Perfect	V-ing perfect
I must have trephined you must have trephined he must have trephined we must have trephined you must have trephined they must have trephined	I must have been trephining you must have been trephining he must have been trephining we must have been trephining you must have been trephining they must have been trephining

Negation

Simple form	V-ing form
I must not trephine you must not trephine he must not trephine we must not trephine you must not trephine they must not trephine	I must not be trephining you must not be trephining he must not be trephining we must not be trephining you must not be trephining they must not be trephining
Perfect	V-ing perfect
I must not have trephined you must not have trephined he must not have trephined we must not have trephined you must not have trephined they must not have trephined	I must not have been trephining you must not have been trephining he must not have been trephining we must not have been trephining you must not have been trephining they must not have been trephining

Interrogative form

Simple form	V-ing form
must I trephine? must you trephine? must he trephine? must we trephine? must you trephine? must they trephine?	must I be trephining? must you be trephining? must he be trephining? must we be trephining? must you be trephining? must they be trephining?
Perfect	V-ing perfect
must I have trephined? must you have trephined? must he have trephined? must we have trephined? must you have trephined? must they have trephined?	must I have been trephining? must you have been trephining? must he have been trephining? must we have been trephining? must you have been trephining? must they have been trephining?

Interro-negative form

Simple form	V-ing form
must I not trephine? must you not trephine? must he not trephine? must we not trephine? must you not trephine? must they not trephine?	must I not be trephining? must you not be trephining? must he not be trephining? must we not be trephining? must you not be trephining? must they not be trephining?
Perfect	V-ing perfect
must I not have trephined? must you not have trephined? must he not have trephined? must we not have trephined? must you not have trephined? must they not have trephined?	must I not have been trephining? must you not have been trephining? must he not have been trephining? must we not have been trephining? must you not have been trephining? must they not have been trephining?