I must troll you must troll she must troll we must troll you must troll they must troll
V-ing form
I must be trolling you must be trolling she must be trolling we must be trolling you must be trolling they must be trolling
Perfect
I must have trolled you must have trolled she must have trolled we must have trolled you must have trolled they must have trolled
V-ing perfect
I must have been trolling you must have been trolling she must have been trolling we must have been trolling you must have been trolling they must have been trolling
Negation
Simple form
I mustn't troll you mustn't troll she mustn't troll we mustn't troll you mustn't troll they mustn't troll
V-ing form
I mustn't be trolling you mustn't be trolling she mustn't be trolling we mustn't be trolling you mustn't be trolling they mustn't be trolling
Perfect
I mustn't have trolled you mustn't have trolled she mustn't have trolled we mustn't have trolled you mustn't have trolled they mustn't have trolled
V-ing perfect
I mustn't have been trolling you mustn't have been trolling she mustn't have been trolling we mustn't have been trolling you mustn't have been trolling they mustn't have been trolling
Interrogative form
Simple form
must I troll? must you troll? must she troll? must we troll? must you troll? must they troll?
V-ing form
must I be trolling? must you be trolling? must she be trolling? must we be trolling? must you be trolling? must they be trolling?
Perfect
must I have trolled? must you have trolled? must she have trolled? must we have trolled? must you have trolled? must they have trolled?
V-ing perfect
must I have been trolling? must you have been trolling? must she have been trolling? must we have been trolling? must you have been trolling? must they have been trolling?
Interro-negative form
Simple form
mustn't I troll? mustn't you troll? mustn't she troll? mustn't we troll? mustn't you troll? mustn't they troll?
V-ing form
mustn't I be trolling? mustn't you be trolling? mustn't she be trolling? mustn't we be trolling? mustn't you be trolling? mustn't they be trolling?
Perfect
mustn't I have trolled? mustn't you have trolled? mustn't she have trolled? mustn't we have trolled? mustn't you have trolled? mustn't they have trolled?
V-ing perfect
mustn't I have been trolling? mustn't you have been trolling? mustn't she have been trolling? mustn't we have been trolling? mustn't you have been trolling? mustn't they have been trolling?