I must stride you must stride she must stride we must stride you must stride they must stride
V-ing form
I must be striding you must be striding she must be striding we must be striding you must be striding they must be striding
Perfect
I must have stridden you must have stridden she 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 she 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 she 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 she 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 she 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 she 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 she stride? must we stride? must you stride? must they stride?
V-ing form
must I be striding? must you be striding? must she be striding? must we be striding? must you be striding? must they be striding?
Perfect
must I have stridden? must you have stridden? must she 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 she 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 she 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 she 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 she 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 she have been striding? mustn't we have been striding? mustn't you have been striding? mustn't they have been striding?