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