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