I must graze you must graze she must graze we must graze you must graze they must graze
V-ing form
I must be grazing you must be grazing she must be grazing we must be grazing you must be grazing they must be grazing
Perfect
I must have grazed you must have grazed she 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 she must have been grazing we must have been grazing you must have been grazing they must have been grazing
Negation
Simple form
I must not graze you must not graze she must not graze we must not graze you must not graze they must not graze
V-ing form
I must not be grazing you must not be grazing she must not be grazing we must not be grazing you must not be grazing they must not be grazing
Perfect
I must not have grazed you must not have grazed she must not have grazed we must not have grazed you must not have grazed they must not have grazed
V-ing perfect
I must not have been grazing you must not have been grazing she must not have been grazing we must not have been grazing you must not have been grazing they must not have been grazing
Interrogative form
Simple form
must I graze? must you graze? must she graze? must we graze? must you graze? must they graze?
V-ing form
must I be grazing? must you be grazing? must she be grazing? must we be grazing? must you be grazing? must they be grazing?
Perfect
must I have grazed? must you have grazed? must she 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 she have been grazing? must we have been grazing? must you have been grazing? must they have been grazing?
Interro-negative form
Simple form
must I not graze? must you not graze? must she not graze? must we not graze? must you not graze? must they not graze?
V-ing form
must I not be grazing? must you not be grazing? must she not be grazing? must we not be grazing? must you not be grazing? must they not be grazing?
Perfect
must I not have grazed? must you not have grazed? must she not have grazed? must we not have grazed? must you not have grazed? must they not have grazed?
V-ing perfect
must I not have been grazing? must you not have been grazing? must she not have been grazing? must we not have been grazing? must you not have been grazing? must they not have been grazing?