I must barter you must barter she must barter we must barter you must barter they must barter
V-ing form
I must be bartering you must be bartering she must be bartering we must be bartering you must be bartering they must be bartering
Perfect
I must have bartered you must have bartered she 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 she must have been bartering we must have been bartering you must have been bartering they must have been bartering
Negation
Simple form
I must not barter you must not barter she must not barter we must not barter you must not barter they must not barter
V-ing form
I must not be bartering you must not be bartering she must not be bartering we must not be bartering you must not be bartering they must not be bartering
Perfect
I must not have bartered you must not have bartered she must not have bartered we must not have bartered you must not have bartered they must not have bartered
V-ing perfect
I must not have been bartering you must not have been bartering she must not have been bartering we must not have been bartering you must not have been bartering they must not have been bartering
Interrogative form
Simple form
must I barter? must you barter? must she barter? must we barter? must you barter? must they barter?
V-ing form
must I be bartering? must you be bartering? must she be bartering? must we be bartering? must you be bartering? must they be bartering?
Perfect
must I have bartered? must you have bartered? must she 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 she have been bartering? must we have been bartering? must you have been bartering? must they have been bartering?
Interro-negative form
Simple form
must I not barter? must you not barter? must she not barter? must we not barter? must you not barter? must they not barter?
V-ing form
must I not be bartering? must you not be bartering? must she not be bartering? must we not be bartering? must you not be bartering? must they not be bartering?
Perfect
must I not have bartered? must you not have bartered? must she not have bartered? must we not have bartered? must you not have bartered? must they not have bartered?
V-ing perfect
must I not have been bartering? must you not have been bartering? must she not have been bartering? must we not have been bartering? must you not have been bartering? must they not have been bartering?