I must fair you must fair he must fair we must fair you must fair they must fair
V-ing form
I must be fairing you must be fairing he must be fairing we must be fairing you must be fairing they must be fairing
Perfect
I must have faired you must have faired he must have faired we must have faired you must have faired they must have faired
V-ing perfect
I must have been fairing you must have been fairing he must have been fairing we must have been fairing you must have been fairing they must have been fairing
Negation
Simple form
I must not fair you must not fair he must not fair we must not fair you must not fair they must not fair
V-ing form
I must not be fairing you must not be fairing he must not be fairing we must not be fairing you must not be fairing they must not be fairing
Perfect
I must not have faired you must not have faired he must not have faired we must not have faired you must not have faired they must not have faired
V-ing perfect
I must not have been fairing you must not have been fairing he must not have been fairing we must not have been fairing you must not have been fairing they must not have been fairing
Interrogative form
Simple form
must I fair? must you fair? must he fair? must we fair? must you fair? must they fair?
V-ing form
must I be fairing? must you be fairing? must he be fairing? must we be fairing? must you be fairing? must they be fairing?
Perfect
must I have faired? must you have faired? must he have faired? must we have faired? must you have faired? must they have faired?
V-ing perfect
must I have been fairing? must you have been fairing? must he have been fairing? must we have been fairing? must you have been fairing? must they have been fairing?
Interro-negative form
Simple form
must I not fair? must you not fair? must he not fair? must we not fair? must you not fair? must they not fair?
V-ing form
must I not be fairing? must you not be fairing? must he not be fairing? must we not be fairing? must you not be fairing? must they not be fairing?
Perfect
must I not have faired? must you not have faired? must he not have faired? must we not have faired? must you not have faired? must they not have faired?
V-ing perfect
must I not have been fairing? must you not have been fairing? must he not have been fairing? must we not have been fairing? must you not have been fairing? must they not have been fairing?