English verb conjugation
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Regular verb: fast - fasted - fasted

Affirmation

Simple form	V-ing form
I must fast you must fast he must fast we must fast you must fast they must fast	I must be fasting you must be fasting he must be fasting we must be fasting you must be fasting they must be fasting
Perfect	V-ing perfect
I must have fasted you must have fasted he must have fasted we must have fasted you must have fasted they must have fasted	I must have been fasting you must have been fasting he must have been fasting we must have been fasting you must have been fasting they must have been fasting

Negation

Simple form	V-ing form
I mustn't fast you mustn't fast he mustn't fast we mustn't fast you mustn't fast they mustn't fast	I mustn't be fasting you mustn't be fasting he mustn't be fasting we mustn't be fasting you mustn't be fasting they mustn't be fasting
Perfect	V-ing perfect
I mustn't have fasted you mustn't have fasted he mustn't have fasted we mustn't have fasted you mustn't have fasted they mustn't have fasted	I mustn't have been fasting you mustn't have been fasting he mustn't have been fasting we mustn't have been fasting you mustn't have been fasting they mustn't have been fasting

Interrogative form

Simple form	V-ing form
must I fast? must you fast? must he fast? must we fast? must you fast? must they fast?	must I be fasting? must you be fasting? must he be fasting? must we be fasting? must you be fasting? must they be fasting?
Perfect	V-ing perfect
must I have fasted? must you have fasted? must he have fasted? must we have fasted? must you have fasted? must they have fasted?	must I have been fasting? must you have been fasting? must he have been fasting? must we have been fasting? must you have been fasting? must they have been fasting?

Interro-negative form

Simple form	V-ing form
mustn't I fast? mustn't you fast? mustn't he fast? mustn't we fast? mustn't you fast? mustn't they fast?	mustn't I be fasting? mustn't you be fasting? mustn't he be fasting? mustn't we be fasting? mustn't you be fasting? mustn't they be fasting?
Perfect	V-ing perfect
mustn't I have fasted? mustn't you have fasted? mustn't he have fasted? mustn't we have fasted? mustn't you have fasted? mustn't they have fasted?	mustn't I have been fasting? mustn't you have been fasting? mustn't he have been fasting? mustn't we have been fasting? mustn't you have been fasting? mustn't they have been fasting?