I must barter you must barter he must barter we must barter you must barter they must barter
V-ing form
I must be bartering you must be bartering he must be bartering we must be bartering you must be bartering they must be bartering
Perfect
I must have bartered you must have bartered he must have bartered we must have bartered you must have bartered they must have bartered
V-ing perfect
I must have been bartering you must have been bartering he must have been bartering we must have been bartering you must have been bartering they must have been bartering
Negation
Simple form
I mustn't barter you mustn't barter he mustn't barter we mustn't barter you mustn't barter they mustn't barter
V-ing form
I mustn't be bartering you mustn't be bartering he mustn't be bartering we mustn't be bartering you mustn't be bartering they mustn't be bartering
Perfect
I mustn't have bartered you mustn't have bartered he mustn't have bartered we mustn't have bartered you mustn't have bartered they mustn't have bartered
V-ing perfect
I mustn't have been bartering you mustn't have been bartering he mustn't have been bartering we mustn't have been bartering you mustn't have been bartering they mustn't have been bartering
Interrogative form
Simple form
must I barter? must you barter? must he barter? must we barter? must you barter? must they barter?
V-ing form
must I be bartering? must you be bartering? must he be bartering? must we be bartering? must you be bartering? must they be bartering?
Perfect
must I have bartered? must you have bartered? must he have bartered? must we have bartered? must you have bartered? must they have bartered?
V-ing perfect
must I have been bartering? must you have been bartering? must he have been bartering? must we have been bartering? must you have been bartering? must they have been bartering?
Interro-negative form
Simple form
mustn't I barter? mustn't you barter? mustn't he barter? mustn't we barter? mustn't you barter? mustn't they barter?
V-ing form
mustn't I be bartering? mustn't you be bartering? mustn't he be bartering? mustn't we be bartering? mustn't you be bartering? mustn't they be bartering?
Perfect
mustn't I have bartered? mustn't you have bartered? mustn't he have bartered? mustn't we have bartered? mustn't you have bartered? mustn't they have bartered?
V-ing perfect
mustn't I have been bartering? mustn't you have been bartering? mustn't he have been bartering? mustn't we have been bartering? mustn't you have been bartering? mustn't they have been bartering?