I must bug you must bug he must bug we must bug you must bug they must bug
V-ing form
I must be bugging you must be bugging he must be bugging we must be bugging you must be bugging they must be bugging
Perfect
I must have bugged you must have bugged he must have bugged we must have bugged you must have bugged they must have bugged
V-ing perfect
I must have been bugging you must have been bugging he must have been bugging we must have been bugging you must have been bugging they must have been bugging
Negation
Simple form
I must not bug you must not bug he must not bug we must not bug you must not bug they must not bug
V-ing form
I must not be bugging you must not be bugging he must not be bugging we must not be bugging you must not be bugging they must not be bugging
Perfect
I must not have bugged you must not have bugged he must not have bugged we must not have bugged you must not have bugged they must not have bugged
V-ing perfect
I must not have been bugging you must not have been bugging he must not have been bugging we must not have been bugging you must not have been bugging they must not have been bugging
Interrogative form
Simple form
must I bug? must you bug? must he bug? must we bug? must you bug? must they bug?
V-ing form
must I be bugging? must you be bugging? must he be bugging? must we be bugging? must you be bugging? must they be bugging?
Perfect
must I have bugged? must you have bugged? must he have bugged? must we have bugged? must you have bugged? must they have bugged?
V-ing perfect
must I have been bugging? must you have been bugging? must he have been bugging? must we have been bugging? must you have been bugging? must they have been bugging?
Interro-negative form
Simple form
must I not bug? must you not bug? must he not bug? must we not bug? must you not bug? must they not bug?
V-ing form
must I not be bugging? must you not be bugging? must he not be bugging? must we not be bugging? must you not be bugging? must they not be bugging?
Perfect
must I not have bugged? must you not have bugged? must he not have bugged? must we not have bugged? must you not have bugged? must they not have bugged?
V-ing perfect
must I not have been bugging? must you not have been bugging? must he not have been bugging? must we not have been bugging? must you not have been bugging? must they not have been bugging?