I must refute you must refute he must refute we must refute you must refute they must refute
V-ing form
I must be refuting you must be refuting he must be refuting we must be refuting you must be refuting they must be refuting
Perfect
I must have refuted you must have refuted he must have refuted we must have refuted you must have refuted they must have refuted
V-ing perfect
I must have been refuting you must have been refuting he must have been refuting we must have been refuting you must have been refuting they must have been refuting
Negation
Simple form
I must not refute you must not refute he must not refute we must not refute you must not refute they must not refute
V-ing form
I must not be refuting you must not be refuting he must not be refuting we must not be refuting you must not be refuting they must not be refuting
Perfect
I must not have refuted you must not have refuted he must not have refuted we must not have refuted you must not have refuted they must not have refuted
V-ing perfect
I must not have been refuting you must not have been refuting he must not have been refuting we must not have been refuting you must not have been refuting they must not have been refuting
Interrogative form
Simple form
must I refute? must you refute? must he refute? must we refute? must you refute? must they refute?
V-ing form
must I be refuting? must you be refuting? must he be refuting? must we be refuting? must you be refuting? must they be refuting?
Perfect
must I have refuted? must you have refuted? must he have refuted? must we have refuted? must you have refuted? must they have refuted?
V-ing perfect
must I have been refuting? must you have been refuting? must he have been refuting? must we have been refuting? must you have been refuting? must they have been refuting?
Interro-negative form
Simple form
must I not refute? must you not refute? must he not refute? must we not refute? must you not refute? must they not refute?
V-ing form
must I not be refuting? must you not be refuting? must he not be refuting? must we not be refuting? must you not be refuting? must they not be refuting?
Perfect
must I not have refuted? must you not have refuted? must he not have refuted? must we not have refuted? must you not have refuted? must they not have refuted?
V-ing perfect
must I not have been refuting? must you not have been refuting? must he not have been refuting? must we not have been refuting? must you not have been refuting? must they not have been refuting?