I must housebreak you must housebreak he must housebreak we must housebreak you must housebreak they must housebreak
V-ing form
I must be housebreaking you must be housebreaking he must be housebreaking we must be housebreaking you must be housebreaking they must be housebreaking
Perfect
I must have housebroken you must have housebroken he 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 he 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 he 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 he 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 he 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 he 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 he housebreak? must we housebreak? must you housebreak? must they housebreak?
V-ing form
must I be housebreaking? must you be housebreaking? must he be housebreaking? must we be housebreaking? must you be housebreaking? must they be housebreaking?
Perfect
must I have housebroken? must you have housebroken? must he 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 he 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 he 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 he 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 he 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 he not have been housebreaking? must we not have been housebreaking? must you not have been housebreaking? must they not have been housebreaking?