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 mustn't lug you mustn't lug he mustn't lug we mustn't lug you mustn't lug they mustn't lug
V-ing form
I mustn't be lugging you mustn't be lugging he mustn't be lugging we mustn't be lugging you mustn't be lugging they mustn't be lugging
Perfect
I mustn't have lugged you mustn't have lugged he mustn't have lugged we mustn't have lugged you mustn't have lugged they mustn't have lugged
V-ing perfect
I mustn't have been lugging you mustn't have been lugging he mustn't have been lugging we mustn't have been lugging you mustn't have been lugging they mustn't 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
mustn't I lug? mustn't you lug? mustn't he lug? mustn't we lug? mustn't you lug? mustn't they lug?
V-ing form
mustn't I be lugging? mustn't you be lugging? mustn't he be lugging? mustn't we be lugging? mustn't you be lugging? mustn't they be lugging?
Perfect
mustn't I have lugged? mustn't you have lugged? mustn't he have lugged? mustn't we have lugged? mustn't you have lugged? mustn't they have lugged?
V-ing perfect
mustn't I have been lugging? mustn't you have been lugging? mustn't he have been lugging? mustn't we have been lugging? mustn't you have been lugging? mustn't they have been lugging?