I must enamel you must enamel she must enamel we must enamel you must enamel they must enamel
V-ing form
I must be enamelling you must be enamelling she must be enamelling we must be enamelling you must be enamelling they must be enamelling
Perfect
I must have enamelled you must have enamelled she must have enamelled we must have enamelled you must have enamelled they must have enamelled
V-ing perfect
I must have been enamelling you must have been enamelling she must have been enamelling we must have been enamelling you must have been enamelling they must have been enamelling
Negation
Simple form
I must not enamel you must not enamel she must not enamel we must not enamel you must not enamel they must not enamel
V-ing form
I must not be enamelling you must not be enamelling she must not be enamelling we must not be enamelling you must not be enamelling they must not be enamelling
Perfect
I must not have enamelled you must not have enamelled she must not have enamelled we must not have enamelled you must not have enamelled they must not have enamelled
V-ing perfect
I must not have been enamelling you must not have been enamelling she must not have been enamelling we must not have been enamelling you must not have been enamelling they must not have been enamelling
Interrogative form
Simple form
must I enamel? must you enamel? must she enamel? must we enamel? must you enamel? must they enamel?
V-ing form
must I be enamelling? must you be enamelling? must she be enamelling? must we be enamelling? must you be enamelling? must they be enamelling?
Perfect
must I have enamelled? must you have enamelled? must she have enamelled? must we have enamelled? must you have enamelled? must they have enamelled?
V-ing perfect
must I have been enamelling? must you have been enamelling? must she have been enamelling? must we have been enamelling? must you have been enamelling? must they have been enamelling?
Interro-negative form
Simple form
must I not enamel? must you not enamel? must she not enamel? must we not enamel? must you not enamel? must they not enamel?
V-ing form
must I not be enamelling? must you not be enamelling? must she not be enamelling? must we not be enamelling? must you not be enamelling? must they not be enamelling?
Perfect
must I not have enamelled? must you not have enamelled? must she not have enamelled? must we not have enamelled? must you not have enamelled? must they not have enamelled?
V-ing perfect
must I not have been enamelling? must you not have been enamelling? must she not have been enamelling? must we not have been enamelling? must you not have been enamelling? must they not have been enamelling?