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 mustn't trephine you mustn't trephine he mustn't trephine we mustn't trephine you mustn't trephine they mustn't trephine	I mustn't be trephining you mustn't be trephining he mustn't be trephining we mustn't be trephining you mustn't be trephining they mustn't be trephining
Perfect	V-ing perfect
I mustn't have trephined you mustn't have trephined he mustn't have trephined we mustn't have trephined you mustn't have trephined they mustn't have trephined	I mustn't have been trephining you mustn't have been trephining he mustn't have been trephining we mustn't have been trephining you mustn't have been trephining they mustn't 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
mustn't I trephine? mustn't you trephine? mustn't he trephine? mustn't we trephine? mustn't you trephine? mustn't they trephine?	mustn't I be trephining? mustn't you be trephining? mustn't he be trephining? mustn't we be trephining? mustn't you be trephining? mustn't they be trephining?
Perfect	V-ing perfect
mustn't I have trephined? mustn't you have trephined? mustn't he have trephined? mustn't we have trephined? mustn't you have trephined? mustn't they have trephined?	mustn't I have been trephining? mustn't you have been trephining? mustn't he have been trephining? mustn't we have been trephining? mustn't you have been trephining? mustn't they have been trephining?