I must oil you must oil she must oil we must oil you must oil they must oil
V-ing form
I must be oiling you must be oiling she must be oiling we must be oiling you must be oiling they must be oiling
Perfect
I must have oiled you must have oiled she must have oiled we must have oiled you must have oiled they must have oiled
V-ing perfect
I must have been oiling you must have been oiling she must have been oiling we must have been oiling you must have been oiling they must have been oiling
Negation
Simple form
I must not oil you must not oil she must not oil we must not oil you must not oil they must not oil
V-ing form
I must not be oiling you must not be oiling she must not be oiling we must not be oiling you must not be oiling they must not be oiling
Perfect
I must not have oiled you must not have oiled she must not have oiled we must not have oiled you must not have oiled they must not have oiled
V-ing perfect
I must not have been oiling you must not have been oiling she must not have been oiling we must not have been oiling you must not have been oiling they must not have been oiling
Interrogative form
Simple form
must I oil? must you oil? must she oil? must we oil? must you oil? must they oil?
V-ing form
must I be oiling? must you be oiling? must she be oiling? must we be oiling? must you be oiling? must they be oiling?
Perfect
must I have oiled? must you have oiled? must she have oiled? must we have oiled? must you have oiled? must they have oiled?
V-ing perfect
must I have been oiling? must you have been oiling? must she have been oiling? must we have been oiling? must you have been oiling? must they have been oiling?
Interro-negative form
Simple form
must I not oil? must you not oil? must she not oil? must we not oil? must you not oil? must they not oil?
V-ing form
must I not be oiling? must you not be oiling? must she not be oiling? must we not be oiling? must you not be oiling? must they not be oiling?
Perfect
must I not have oiled? must you not have oiled? must she not have oiled? must we not have oiled? must you not have oiled? must they not have oiled?
V-ing perfect
must I not have been oiling? must you not have been oiling? must she not have been oiling? must we not have been oiling? must you not have been oiling? must they not have been oiling?