English verb conjugation
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Regular verb: fast - fasted - fasted

Affirmation

Simple form	V-ing form
I must fast you must fast she must fast we must fast you must fast they must fast	I must be fasting you must be fasting she 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 she 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 she 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 she 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 she 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 she 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 she 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 she fast? must we fast? must you fast? must they fast?	must I be fasting? must you be fasting? must she 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 she 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 she 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 she 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 she 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 she 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 she have been fasting? mustn't we have been fasting? mustn't you have been fasting? mustn't they have been fasting?