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