I must housebreak you must housebreak she must housebreak we must housebreak you must housebreak they must housebreak
V-ing form
I must be housebreaking you must be housebreaking she must be housebreaking we must be housebreaking you must be housebreaking they must be housebreaking
Perfect
I must have housebroken you must have housebroken she must have housebroken we must have housebroken you must have housebroken they must have housebroken
V-ing perfect
I must have been housebreaking you must have been housebreaking she must have been housebreaking we must have been housebreaking you must have been housebreaking they must have been housebreaking
Negation
Simple form
I must not housebreak you must not housebreak she must not housebreak we must not housebreak you must not housebreak they must not housebreak
V-ing form
I must not be housebreaking you must not be housebreaking she must not be housebreaking we must not be housebreaking you must not be housebreaking they must not be housebreaking
Perfect
I must not have housebroken you must not have housebroken she must not have housebroken we must not have housebroken you must not have housebroken they must not have housebroken
V-ing perfect
I must not have been housebreaking you must not have been housebreaking she must not have been housebreaking we must not have been housebreaking you must not have been housebreaking they must not have been housebreaking
Interrogative form
Simple form
must I housebreak? must you housebreak? must she housebreak? must we housebreak? must you housebreak? must they housebreak?
V-ing form
must I be housebreaking? must you be housebreaking? must she be housebreaking? must we be housebreaking? must you be housebreaking? must they be housebreaking?
Perfect
must I have housebroken? must you have housebroken? must she have housebroken? must we have housebroken? must you have housebroken? must they have housebroken?
V-ing perfect
must I have been housebreaking? must you have been housebreaking? must she have been housebreaking? must we have been housebreaking? must you have been housebreaking? must they have been housebreaking?
Interro-negative form
Simple form
must I not housebreak? must you not housebreak? must she not housebreak? must we not housebreak? must you not housebreak? must they not housebreak?
V-ing form
must I not be housebreaking? must you not be housebreaking? must she not be housebreaking? must we not be housebreaking? must you not be housebreaking? must they not be housebreaking?
Perfect
must I not have housebroken? must you not have housebroken? must she not have housebroken? must we not have housebroken? must you not have housebroken? must they not have housebroken?
V-ing perfect
must I not have been housebreaking? must you not have been housebreaking? must she not have been housebreaking? must we not have been housebreaking? must you not have been housebreaking? must they not have been housebreaking?