I must fatten you must fatten he must fatten we must fatten you must fatten they must fatten
V-ing form
I must be fattening you must be fattening he must be fattening we must be fattening you must be fattening they must be fattening
Perfect
I must have fattened you must have fattened he must have fattened we must have fattened you must have fattened they must have fattened
V-ing perfect
I must have been fattening you must have been fattening he must have been fattening we must have been fattening you must have been fattening they must have been fattening
Negation
Simple form
I must not fatten you must not fatten he must not fatten we must not fatten you must not fatten they must not fatten
V-ing form
I must not be fattening you must not be fattening he must not be fattening we must not be fattening you must not be fattening they must not be fattening
Perfect
I must not have fattened you must not have fattened he must not have fattened we must not have fattened you must not have fattened they must not have fattened
V-ing perfect
I must not have been fattening you must not have been fattening he must not have been fattening we must not have been fattening you must not have been fattening they must not have been fattening
Interrogative form
Simple form
must I fatten? must you fatten? must he fatten? must we fatten? must you fatten? must they fatten?
V-ing form
must I be fattening? must you be fattening? must he be fattening? must we be fattening? must you be fattening? must they be fattening?
Perfect
must I have fattened? must you have fattened? must he have fattened? must we have fattened? must you have fattened? must they have fattened?
V-ing perfect
must I have been fattening? must you have been fattening? must he have been fattening? must we have been fattening? must you have been fattening? must they have been fattening?
Interro-negative form
Simple form
must I not fatten? must you not fatten? must he not fatten? must we not fatten? must you not fatten? must they not fatten?
V-ing form
must I not be fattening? must you not be fattening? must he not be fattening? must we not be fattening? must you not be fattening? must they not be fattening?
Perfect
must I not have fattened? must you not have fattened? must he not have fattened? must we not have fattened? must you not have fattened? must they not have fattened?
V-ing perfect
must I not have been fattening? must you not have been fattening? must he not have been fattening? must we not have been fattening? must you not have been fattening? must they not have been fattening?