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 must not fast you must not fast she must not fast we must not fast you must not fast they must not fast	I must not be fasting you must not be fasting she must not be fasting we must not be fasting you must not be fasting they must not be fasting
Perfect	V-ing perfect
I must not have fasted you must not have fasted she must not have fasted we must not have fasted you must not have fasted they must not have fasted	I must not have been fasting you must not have been fasting she must not have been fasting we must not have been fasting you must not have been fasting they must not 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
must I not fast? must you not fast? must she not fast? must we not fast? must you not fast? must they not fast?	must I not be fasting? must you not be fasting? must she not be fasting? must we not be fasting? must you not be fasting? must they not be fasting?
Perfect	V-ing perfect
must I not have fasted? must you not have fasted? must she not have fasted? must we not have fasted? must you not have fasted? must they not have fasted?	must I not have been fasting? must you not have been fasting? must she not have been fasting? must we not have been fasting? must you not have been fasting? must they not have been fasting?