I must deforce you must deforce he must deforce we must deforce you must deforce they must deforce
V-ing form
I must be deforcing you must be deforcing he must be deforcing we must be deforcing you must be deforcing they must be deforcing
Perfect
I must have deforced you must have deforced he must have deforced we must have deforced you must have deforced they must have deforced
V-ing perfect
I must have been deforcing you must have been deforcing he must have been deforcing we must have been deforcing you must have been deforcing they must have been deforcing
Negation
Simple form
I must not deforce you must not deforce he must not deforce we must not deforce you must not deforce they must not deforce
V-ing form
I must not be deforcing you must not be deforcing he must not be deforcing we must not be deforcing you must not be deforcing they must not be deforcing
Perfect
I must not have deforced you must not have deforced he must not have deforced we must not have deforced you must not have deforced they must not have deforced
V-ing perfect
I must not have been deforcing you must not have been deforcing he must not have been deforcing we must not have been deforcing you must not have been deforcing they must not have been deforcing
Interrogative form
Simple form
must I deforce? must you deforce? must he deforce? must we deforce? must you deforce? must they deforce?
V-ing form
must I be deforcing? must you be deforcing? must he be deforcing? must we be deforcing? must you be deforcing? must they be deforcing?
Perfect
must I have deforced? must you have deforced? must he have deforced? must we have deforced? must you have deforced? must they have deforced?
V-ing perfect
must I have been deforcing? must you have been deforcing? must he have been deforcing? must we have been deforcing? must you have been deforcing? must they have been deforcing?
Interro-negative form
Simple form
must I not deforce? must you not deforce? must he not deforce? must we not deforce? must you not deforce? must they not deforce?
V-ing form
must I not be deforcing? must you not be deforcing? must he not be deforcing? must we not be deforcing? must you not be deforcing? must they not be deforcing?
Perfect
must I not have deforced? must you not have deforced? must he not have deforced? must we not have deforced? must you not have deforced? must they not have deforced?
V-ing perfect
must I not have been deforcing? must you not have been deforcing? must he not have been deforcing? must we not have been deforcing? must you not have been deforcing? must they not have been deforcing?