I must average you must average he must average we must average you must average they must average
V-ing form
I must be averaging you must be averaging he must be averaging we must be averaging you must be averaging they must be averaging
Perfect
I must have averaged you must have averaged he must have averaged we must have averaged you must have averaged they must have averaged
V-ing perfect
I must have been averaging you must have been averaging he must have been averaging we must have been averaging you must have been averaging they must have been averaging
Negation
Simple form
I mustn't average you mustn't average he mustn't average we mustn't average you mustn't average they mustn't average
V-ing form
I mustn't be averaging you mustn't be averaging he mustn't be averaging we mustn't be averaging you mustn't be averaging they mustn't be averaging
Perfect
I mustn't have averaged you mustn't have averaged he mustn't have averaged we mustn't have averaged you mustn't have averaged they mustn't have averaged
V-ing perfect
I mustn't have been averaging you mustn't have been averaging he mustn't have been averaging we mustn't have been averaging you mustn't have been averaging they mustn't have been averaging
Interrogative form
Simple form
must I average? must you average? must he average? must we average? must you average? must they average?
V-ing form
must I be averaging? must you be averaging? must he be averaging? must we be averaging? must you be averaging? must they be averaging?
Perfect
must I have averaged? must you have averaged? must he have averaged? must we have averaged? must you have averaged? must they have averaged?
V-ing perfect
must I have been averaging? must you have been averaging? must he have been averaging? must we have been averaging? must you have been averaging? must they have been averaging?
Interro-negative form
Simple form
mustn't I average? mustn't you average? mustn't he average? mustn't we average? mustn't you average? mustn't they average?
V-ing form
mustn't I be averaging? mustn't you be averaging? mustn't he be averaging? mustn't we be averaging? mustn't you be averaging? mustn't they be averaging?
Perfect
mustn't I have averaged? mustn't you have averaged? mustn't he have averaged? mustn't we have averaged? mustn't you have averaged? mustn't they have averaged?
V-ing perfect
mustn't I have been averaging? mustn't you have been averaging? mustn't he have been averaging? mustn't we have been averaging? mustn't you have been averaging? mustn't they have been averaging?