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