I must break you must break she must break we must break you must break they must break
V-ing form
I must be breaking you must be breaking she must be breaking we must be breaking you must be breaking they must be breaking
Perfect
I must have broken you must have broken she must have broken we must have broken you must have broken they must have broken
V-ing perfect
I must have been breaking you must have been breaking she must have been breaking we must have been breaking you must have been breaking they must have been breaking
Negation
Simple form
I must not break you must not break she must not break we must not break you must not break they must not break
V-ing form
I must not be breaking you must not be breaking she must not be breaking we must not be breaking you must not be breaking they must not be breaking
Perfect
I must not have broken you must not have broken she must not have broken we must not have broken you must not have broken they must not have broken
V-ing perfect
I must not have been breaking you must not have been breaking she must not have been breaking we must not have been breaking you must not have been breaking they must not have been breaking
Interrogative form
Simple form
must I break? must you break? must she break? must we break? must you break? must they break?
V-ing form
must I be breaking? must you be breaking? must she be breaking? must we be breaking? must you be breaking? must they be breaking?
Perfect
must I have broken? must you have broken? must she have broken? must we have broken? must you have broken? must they have broken?
V-ing perfect
must I have been breaking? must you have been breaking? must she have been breaking? must we have been breaking? must you have been breaking? must they have been breaking?
Interro-negative form
Simple form
must I not break? must you not break? must she not break? must we not break? must you not break? must they not break?
V-ing form
must I not be breaking? must you not be breaking? must she not be breaking? must we not be breaking? must you not be breaking? must they not be breaking?
Perfect
must I not have broken? must you not have broken? must she not have broken? must we not have broken? must you not have broken? must they not have broken?
V-ing perfect
must I not have been breaking? must you not have been breaking? must she not have been breaking? must we not have been breaking? must you not have been breaking? must they not have been breaking?