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