I must aviate you must aviate she must aviate we must aviate you must aviate they must aviate
V-ing form
I must be aviating you must be aviating she must be aviating we must be aviating you must be aviating they must be aviating
Perfect
I must have aviated you must have aviated she 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 she 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 she 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 she 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 she 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 she 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 she aviate? must we aviate? must you aviate? must they aviate?
V-ing form
must I be aviating? must you be aviating? must she be aviating? must we be aviating? must you be aviating? must they be aviating?
Perfect
must I have aviated? must you have aviated? must she 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 she 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 she 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 she 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 she 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 she have been aviating? mustn't we have been aviating? mustn't you have been aviating? mustn't they have been aviating?