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 mustn't tan you mustn't tan she mustn't tan we mustn't tan you mustn't tan they mustn't tan
V-ing form
I mustn't be tanning you mustn't be tanning she mustn't be tanning we mustn't be tanning you mustn't be tanning they mustn't be tanning
Perfect
I mustn't have tanned you mustn't have tanned she mustn't have tanned we mustn't have tanned you mustn't have tanned they mustn't have tanned
V-ing perfect
I mustn't have been tanning you mustn't have been tanning she mustn't have been tanning we mustn't have been tanning you mustn't have been tanning they mustn't 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
mustn't I tan? mustn't you tan? mustn't she tan? mustn't we tan? mustn't you tan? mustn't they tan?
V-ing form
mustn't I be tanning? mustn't you be tanning? mustn't she be tanning? mustn't we be tanning? mustn't you be tanning? mustn't they be tanning?
Perfect
mustn't I have tanned? mustn't you have tanned? mustn't she have tanned? mustn't we have tanned? mustn't you have tanned? mustn't they have tanned?
V-ing perfect
mustn't I have been tanning? mustn't you have been tanning? mustn't she have been tanning? mustn't we have been tanning? mustn't you have been tanning? mustn't they have been tanning?