I must fit you must fit he must fit we must fit you must fit they must fit
V-ing form
I must be fitting you must be fitting he must be fitting we must be fitting you must be fitting they must be fitting
Perfect
I must have fit, fitted you must have fit, fitted he must have fit, fitted we must have fit, fitted you must have fit, fitted they must have fit, fitted
V-ing perfect
I must have been fitting you must have been fitting he must have been fitting we must have been fitting you must have been fitting they must have been fitting
Negation
Simple form
I must not fit you must not fit he must not fit we must not fit you must not fit they must not fit
V-ing form
I must not be fitting you must not be fitting he must not be fitting we must not be fitting you must not be fitting they must not be fitting
Perfect
I must not have fit, fitted you must not have fit, fitted he must not have fit, fitted we must not have fit, fitted you must not have fit, fitted they must not have fit, fitted
V-ing perfect
I must not have been fitting you must not have been fitting he must not have been fitting we must not have been fitting you must not have been fitting they must not have been fitting
Interrogative form
Simple form
must I fit? must you fit? must he fit? must we fit? must you fit? must they fit?
V-ing form
must I be fitting? must you be fitting? must he be fitting? must we be fitting? must you be fitting? must they be fitting?
Perfect
must I have fit, fitted? must you have fit, fitted? must he have fit, fitted? must we have fit, fitted? must you have fit, fitted? must they have fit, fitted?
V-ing perfect
must I have been fitting? must you have been fitting? must he have been fitting? must we have been fitting? must you have been fitting? must they have been fitting?
Interro-negative form
Simple form
must I not fit? must you not fit? must he not fit? must we not fit? must you not fit? must they not fit?
V-ing form
must I not be fitting? must you not be fitting? must he not be fitting? must we not be fitting? must you not be fitting? must they not be fitting?
Perfect
must I not have fit, fitted? must you not have fit, fitted? must he not have fit, fitted? must we not have fit, fitted? must you not have fit, fitted? must they not have fit, fitted?
V-ing perfect
must I not have been fitting? must you not have been fitting? must he not have been fitting? must we not have been fitting? must you not have been fitting? must they not have been fitting?