I must age you must age he must age we must age you must age they must age
V-ing form
I must be aging you must be aging he must be aging we must be aging you must be aging they must be aging
Perfect
I must have aged you must have aged he must have aged we must have aged you must have aged they must have aged
V-ing perfect
I must have been aging you must have been aging he must have been aging we must have been aging you must have been aging they must have been aging
Negation
Simple form
I must not age you must not age he must not age we must not age you must not age they must not age
V-ing form
I must not be aging you must not be aging he must not be aging we must not be aging you must not be aging they must not be aging
Perfect
I must not have aged you must not have aged he must not have aged we must not have aged you must not have aged they must not have aged
V-ing perfect
I must not have been aging you must not have been aging he must not have been aging we must not have been aging you must not have been aging they must not have been aging
Interrogative form
Simple form
must I age? must you age? must he age? must we age? must you age? must they age?
V-ing form
must I be aging? must you be aging? must he be aging? must we be aging? must you be aging? must they be aging?
Perfect
must I have aged? must you have aged? must he have aged? must we have aged? must you have aged? must they have aged?
V-ing perfect
must I have been aging? must you have been aging? must he have been aging? must we have been aging? must you have been aging? must they have been aging?
Interro-negative form
Simple form
must I not age? must you not age? must he not age? must we not age? must you not age? must they not age?
V-ing form
must I not be aging? must you not be aging? must he not be aging? must we not be aging? must you not be aging? must they not be aging?
Perfect
must I not have aged? must you not have aged? must he not have aged? must we not have aged? must you not have aged? must they not have aged?
V-ing perfect
must I not have been aging? must you not have been aging? must he not have been aging? must we not have been aging? must you not have been aging? must they not have been aging?