English verb conjugation
MUST PERSEVERE

Regular verb: persevere - persevered - persevered

Affirmation

Simple form	V-ing form
I must persevere you must persevere he must persevere we must persevere you must persevere they must persevere	I must be persevering you must be persevering he must be persevering we must be persevering you must be persevering they must be persevering
Perfect	V-ing perfect
I must have persevered you must have persevered he must have persevered we must have persevered you must have persevered they must have persevered	I must have been persevering you must have been persevering he must have been persevering we must have been persevering you must have been persevering they must have been persevering

Negation

Simple form	V-ing form
I mustn't persevere you mustn't persevere he mustn't persevere we mustn't persevere you mustn't persevere they mustn't persevere	I mustn't be persevering you mustn't be persevering he mustn't be persevering we mustn't be persevering you mustn't be persevering they mustn't be persevering
Perfect	V-ing perfect
I mustn't have persevered you mustn't have persevered he mustn't have persevered we mustn't have persevered you mustn't have persevered they mustn't have persevered	I mustn't have been persevering you mustn't have been persevering he mustn't have been persevering we mustn't have been persevering you mustn't have been persevering they mustn't have been persevering

Interrogative form

Simple form	V-ing form
must I persevere? must you persevere? must he persevere? must we persevere? must you persevere? must they persevere?	must I be persevering? must you be persevering? must he be persevering? must we be persevering? must you be persevering? must they be persevering?
Perfect	V-ing perfect
must I have persevered? must you have persevered? must he have persevered? must we have persevered? must you have persevered? must they have persevered?	must I have been persevering? must you have been persevering? must he have been persevering? must we have been persevering? must you have been persevering? must they have been persevering?

Interro-negative form

Simple form	V-ing form
mustn't I persevere? mustn't you persevere? mustn't he persevere? mustn't we persevere? mustn't you persevere? mustn't they persevere?	mustn't I be persevering? mustn't you be persevering? mustn't he be persevering? mustn't we be persevering? mustn't you be persevering? mustn't they be persevering?
Perfect	V-ing perfect
mustn't I have persevered? mustn't you have persevered? mustn't he have persevered? mustn't we have persevered? mustn't you have persevered? mustn't they have persevered?	mustn't I have been persevering? mustn't you have been persevering? mustn't he have been persevering? mustn't we have been persevering? mustn't you have been persevering? mustn't they have been persevering?