I must winter you must winter he must winter we must winter you must winter they must winter
V-ing form
I must be wintering you must be wintering he must be wintering we must be wintering you must be wintering they must be wintering
Perfect
I must have wintered you must have wintered he must have wintered we must have wintered you must have wintered they must have wintered
V-ing perfect
I must have been wintering you must have been wintering he must have been wintering we must have been wintering you must have been wintering they must have been wintering
Negation
Simple form
I must not winter you must not winter he must not winter we must not winter you must not winter they must not winter
V-ing form
I must not be wintering you must not be wintering he must not be wintering we must not be wintering you must not be wintering they must not be wintering
Perfect
I must not have wintered you must not have wintered he must not have wintered we must not have wintered you must not have wintered they must not have wintered
V-ing perfect
I must not have been wintering you must not have been wintering he must not have been wintering we must not have been wintering you must not have been wintering they must not have been wintering
Interrogative form
Simple form
must I winter? must you winter? must he winter? must we winter? must you winter? must they winter?
V-ing form
must I be wintering? must you be wintering? must he be wintering? must we be wintering? must you be wintering? must they be wintering?
Perfect
must I have wintered? must you have wintered? must he have wintered? must we have wintered? must you have wintered? must they have wintered?
V-ing perfect
must I have been wintering? must you have been wintering? must he have been wintering? must we have been wintering? must you have been wintering? must they have been wintering?
Interro-negative form
Simple form
must I not winter? must you not winter? must he not winter? must we not winter? must you not winter? must they not winter?
V-ing form
must I not be wintering? must you not be wintering? must he not be wintering? must we not be wintering? must you not be wintering? must they not be wintering?
Perfect
must I not have wintered? must you not have wintered? must he not have wintered? must we not have wintered? must you not have wintered? must they not have wintered?
V-ing perfect
must I not have been wintering? must you not have been wintering? must he not have been wintering? must we not have been wintering? must you not have been wintering? must they not have been wintering?