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