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