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