Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must series you must series he must series we must series you must series they must series
V-ing form
I must be seriesing you must be seriesing he must be seriesing we must be seriesing you must be seriesing they must be seriesing
Perfect
I must have seriesed you must have seriesed he must have seriesed we must have seriesed you must have seriesed they must have seriesed
V-ing perfect
I must have been seriesing you must have been seriesing he must have been seriesing we must have been seriesing you must have been seriesing they must have been seriesing
Negation
Simple form
I must not series you must not series he must not series we must not series you must not series they must not series
V-ing form
I must not be seriesing you must not be seriesing he must not be seriesing we must not be seriesing you must not be seriesing they must not be seriesing
Perfect
I must not have seriesed you must not have seriesed he must not have seriesed we must not have seriesed you must not have seriesed they must not have seriesed
V-ing perfect
I must not have been seriesing you must not have been seriesing he must not have been seriesing we must not have been seriesing you must not have been seriesing they must not have been seriesing
Interrogative form
Simple form
must I series? must you series? must he series? must we series? must you series? must they series?
V-ing form
must I be seriesing? must you be seriesing? must he be seriesing? must we be seriesing? must you be seriesing? must they be seriesing?
Perfect
must I have seriesed? must you have seriesed? must he have seriesed? must we have seriesed? must you have seriesed? must they have seriesed?
V-ing perfect
must I have been seriesing? must you have been seriesing? must he have been seriesing? must we have been seriesing? must you have been seriesing? must they have been seriesing?
Interro-negative form
Simple form
must I not series? must you not series? must he not series? must we not series? must you not series? must they not series?
V-ing form
must I not be seriesing? must you not be seriesing? must he not be seriesing? must we not be seriesing? must you not be seriesing? must they not be seriesing?
Perfect
must I not have seriesed? must you not have seriesed? must he not have seriesed? must we not have seriesed? must you not have seriesed? must they not have seriesed?
V-ing perfect
must I not have been seriesing? must you not have been seriesing? must he not have been seriesing? must we not have been seriesing? must you not have been seriesing? must they not have been seriesing?