I must unhitch you must unhitch he must unhitch we must unhitch you must unhitch they must unhitch
V-ing form
I must be unhitching you must be unhitching he must be unhitching we must be unhitching you must be unhitching they must be unhitching
Perfect
I must have unhitched you must have unhitched he must have unhitched we must have unhitched you must have unhitched they must have unhitched
V-ing perfect
I must have been unhitching you must have been unhitching he must have been unhitching we must have been unhitching you must have been unhitching they must have been unhitching
Negation
Simple form
I must not unhitch you must not unhitch he must not unhitch we must not unhitch you must not unhitch they must not unhitch
V-ing form
I must not be unhitching you must not be unhitching he must not be unhitching we must not be unhitching you must not be unhitching they must not be unhitching
Perfect
I must not have unhitched you must not have unhitched he must not have unhitched we must not have unhitched you must not have unhitched they must not have unhitched
V-ing perfect
I must not have been unhitching you must not have been unhitching he must not have been unhitching we must not have been unhitching you must not have been unhitching they must not have been unhitching
Interrogative form
Simple form
must I unhitch? must you unhitch? must he unhitch? must we unhitch? must you unhitch? must they unhitch?
V-ing form
must I be unhitching? must you be unhitching? must he be unhitching? must we be unhitching? must you be unhitching? must they be unhitching?
Perfect
must I have unhitched? must you have unhitched? must he have unhitched? must we have unhitched? must you have unhitched? must they have unhitched?
V-ing perfect
must I have been unhitching? must you have been unhitching? must he have been unhitching? must we have been unhitching? must you have been unhitching? must they have been unhitching?
Interro-negative form
Simple form
must I not unhitch? must you not unhitch? must he not unhitch? must we not unhitch? must you not unhitch? must they not unhitch?
V-ing form
must I not be unhitching? must you not be unhitching? must he not be unhitching? must we not be unhitching? must you not be unhitching? must they not be unhitching?
Perfect
must I not have unhitched? must you not have unhitched? must he not have unhitched? must we not have unhitched? must you not have unhitched? must they not have unhitched?
V-ing perfect
must I not have been unhitching? must you not have been unhitching? must he not have been unhitching? must we not have been unhitching? must you not have been unhitching? must they not have been unhitching?