I must helicopter you must helicopter he must helicopter we must helicopter you must helicopter they must helicopter
V-ing form
I must be helicoptering you must be helicoptering he must be helicoptering we must be helicoptering you must be helicoptering they must be helicoptering
Perfect
I must have helicoptered you must have helicoptered he must have helicoptered we must have helicoptered you must have helicoptered they must have helicoptered
V-ing perfect
I must have been helicoptering you must have been helicoptering he must have been helicoptering we must have been helicoptering you must have been helicoptering they must have been helicoptering
Negation
Simple form
I must not helicopter you must not helicopter he must not helicopter we must not helicopter you must not helicopter they must not helicopter
V-ing form
I must not be helicoptering you must not be helicoptering he must not be helicoptering we must not be helicoptering you must not be helicoptering they must not be helicoptering
Perfect
I must not have helicoptered you must not have helicoptered he must not have helicoptered we must not have helicoptered you must not have helicoptered they must not have helicoptered
V-ing perfect
I must not have been helicoptering you must not have been helicoptering he must not have been helicoptering we must not have been helicoptering you must not have been helicoptering they must not have been helicoptering
Interrogative form
Simple form
must I helicopter? must you helicopter? must he helicopter? must we helicopter? must you helicopter? must they helicopter?
V-ing form
must I be helicoptering? must you be helicoptering? must he be helicoptering? must we be helicoptering? must you be helicoptering? must they be helicoptering?
Perfect
must I have helicoptered? must you have helicoptered? must he have helicoptered? must we have helicoptered? must you have helicoptered? must they have helicoptered?
V-ing perfect
must I have been helicoptering? must you have been helicoptering? must he have been helicoptering? must we have been helicoptering? must you have been helicoptering? must they have been helicoptering?
Interro-negative form
Simple form
must I not helicopter? must you not helicopter? must he not helicopter? must we not helicopter? must you not helicopter? must they not helicopter?
V-ing form
must I not be helicoptering? must you not be helicoptering? must he not be helicoptering? must we not be helicoptering? must you not be helicoptering? must they not be helicoptering?
Perfect
must I not have helicoptered? must you not have helicoptered? must he not have helicoptered? must we not have helicoptered? must you not have helicoptered? must they not have helicoptered?
V-ing perfect
must I not have been helicoptering? must you not have been helicoptering? must he not have been helicoptering? must we not have been helicoptering? must you not have been helicoptering? must they not have been helicoptering?