I must fair you must fair she must fair we must fair you must fair they must fair
V-ing form
I must be fairing you must be fairing she must be fairing we must be fairing you must be fairing they must be fairing
Perfect
I must have faired you must have faired she 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 she must have been fairing we must have been fairing you must have been fairing they must have been fairing
Negation
Simple form
I mustn't fair you mustn't fair she mustn't fair we mustn't fair you mustn't fair they mustn't fair
V-ing form
I mustn't be fairing you mustn't be fairing she mustn't be fairing we mustn't be fairing you mustn't be fairing they mustn't be fairing
Perfect
I mustn't have faired you mustn't have faired she mustn't have faired we mustn't have faired you mustn't have faired they mustn't have faired
V-ing perfect
I mustn't have been fairing you mustn't have been fairing she mustn't have been fairing we mustn't have been fairing you mustn't have been fairing they mustn't have been fairing
Interrogative form
Simple form
must I fair? must you fair? must she fair? must we fair? must you fair? must they fair?
V-ing form
must I be fairing? must you be fairing? must she be fairing? must we be fairing? must you be fairing? must they be fairing?
Perfect
must I have faired? must you have faired? must she 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 she have been fairing? must we have been fairing? must you have been fairing? must they have been fairing?
Interro-negative form
Simple form
mustn't I fair? mustn't you fair? mustn't she fair? mustn't we fair? mustn't you fair? mustn't they fair?
V-ing form
mustn't I be fairing? mustn't you be fairing? mustn't she be fairing? mustn't we be fairing? mustn't you be fairing? mustn't they be fairing?
Perfect
mustn't I have faired? mustn't you have faired? mustn't she have faired? mustn't we have faired? mustn't you have faired? mustn't they have faired?
V-ing perfect
mustn't I have been fairing? mustn't you have been fairing? mustn't she have been fairing? mustn't we have been fairing? mustn't you have been fairing? mustn't they have been fairing?