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