I must tan you must tan she must tan we must tan you must tan they must tan
V-ing form
I must be tanning you must be tanning she must be tanning we must be tanning you must be tanning they must be tanning
Perfect
I must have tanned you must have tanned she must have tanned we must have tanned you must have tanned they must have tanned
V-ing perfect
I must have been tanning you must have been tanning she must have been tanning we must have been tanning you must have been tanning they must have been tanning
Negation
Simple form
I must not tan you must not tan she must not tan we must not tan you must not tan they must not tan
V-ing form
I must not be tanning you must not be tanning she must not be tanning we must not be tanning you must not be tanning they must not be tanning
Perfect
I must not have tanned you must not have tanned she must not have tanned we must not have tanned you must not have tanned they must not have tanned
V-ing perfect
I must not have been tanning you must not have been tanning she must not have been tanning we must not have been tanning you must not have been tanning they must not have been tanning
Interrogative form
Simple form
must I tan? must you tan? must she tan? must we tan? must you tan? must they tan?
V-ing form
must I be tanning? must you be tanning? must she be tanning? must we be tanning? must you be tanning? must they be tanning?
Perfect
must I have tanned? must you have tanned? must she have tanned? must we have tanned? must you have tanned? must they have tanned?
V-ing perfect
must I have been tanning? must you have been tanning? must she have been tanning? must we have been tanning? must you have been tanning? must they have been tanning?
Interro-negative form
Simple form
must I not tan? must you not tan? must she not tan? must we not tan? must you not tan? must they not tan?
V-ing form
must I not be tanning? must you not be tanning? must she not be tanning? must we not be tanning? must you not be tanning? must they not be tanning?
Perfect
must I not have tanned? must you not have tanned? must she not have tanned? must we not have tanned? must you not have tanned? must they not have tanned?
V-ing perfect
must I not have been tanning? must you not have been tanning? must she not have been tanning? must we not have been tanning? must you not have been tanning? must they not have been tanning?