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