I must lug you must lug he must lug we must lug you must lug they must lug
V-ing form
I must be lugging you must be lugging he must be lugging we must be lugging you must be lugging they must be lugging
Perfect
I must have lugged you must have lugged he must have lugged we must have lugged you must have lugged they must have lugged
V-ing perfect
I must have been lugging you must have been lugging he must have been lugging we must have been lugging you must have been lugging they must have been lugging
Negation
Simple form
I must not lug you must not lug he must not lug we must not lug you must not lug they must not lug
V-ing form
I must not be lugging you must not be lugging he must not be lugging we must not be lugging you must not be lugging they must not be lugging
Perfect
I must not have lugged you must not have lugged he must not have lugged we must not have lugged you must not have lugged they must not have lugged
V-ing perfect
I must not have been lugging you must not have been lugging he must not have been lugging we must not have been lugging you must not have been lugging they must not have been lugging
Interrogative form
Simple form
must I lug? must you lug? must he lug? must we lug? must you lug? must they lug?
V-ing form
must I be lugging? must you be lugging? must he be lugging? must we be lugging? must you be lugging? must they be lugging?
Perfect
must I have lugged? must you have lugged? must he have lugged? must we have lugged? must you have lugged? must they have lugged?
V-ing perfect
must I have been lugging? must you have been lugging? must he have been lugging? must we have been lugging? must you have been lugging? must they have been lugging?
Interro-negative form
Simple form
must I not lug? must you not lug? must he not lug? must we not lug? must you not lug? must they not lug?
V-ing form
must I not be lugging? must you not be lugging? must he not be lugging? must we not be lugging? must you not be lugging? must they not be lugging?
Perfect
must I not have lugged? must you not have lugged? must he not have lugged? must we not have lugged? must you not have lugged? must they not have lugged?
V-ing perfect
must I not have been lugging? must you not have been lugging? must he not have been lugging? must we not have been lugging? must you not have been lugging? must they not have been lugging?