English verb conjugation
MUST REFINE

Regular verb: refine - refined - refined

Affirmation

Simple form	V-ing form
I must refine you must refine he must refine we must refine you must refine they must refine	I must be refining you must be refining he must be refining we must be refining you must be refining they must be refining
Perfect	V-ing perfect
I must have refined you must have refined he must have refined we must have refined you must have refined they must have refined	I must have been refining you must have been refining he must have been refining we must have been refining you must have been refining they must have been refining

Negation

Simple form	V-ing form
I mustn't refine you mustn't refine he mustn't refine we mustn't refine you mustn't refine they mustn't refine	I mustn't be refining you mustn't be refining he mustn't be refining we mustn't be refining you mustn't be refining they mustn't be refining
Perfect	V-ing perfect
I mustn't have refined you mustn't have refined he mustn't have refined we mustn't have refined you mustn't have refined they mustn't have refined	I mustn't have been refining you mustn't have been refining he mustn't have been refining we mustn't have been refining you mustn't have been refining they mustn't have been refining

Interrogative form

Simple form	V-ing form
must I refine? must you refine? must he refine? must we refine? must you refine? must they refine?	must I be refining? must you be refining? must he be refining? must we be refining? must you be refining? must they be refining?
Perfect	V-ing perfect
must I have refined? must you have refined? must he have refined? must we have refined? must you have refined? must they have refined?	must I have been refining? must you have been refining? must he have been refining? must we have been refining? must you have been refining? must they have been refining?

Interro-negative form

Simple form	V-ing form
mustn't I refine? mustn't you refine? mustn't he refine? mustn't we refine? mustn't you refine? mustn't they refine?	mustn't I be refining? mustn't you be refining? mustn't he be refining? mustn't we be refining? mustn't you be refining? mustn't they be refining?
Perfect	V-ing perfect
mustn't I have refined? mustn't you have refined? mustn't he have refined? mustn't we have refined? mustn't you have refined? mustn't they have refined?	mustn't I have been refining? mustn't you have been refining? mustn't he have been refining? mustn't we have been refining? mustn't you have been refining? mustn't they have been refining?