English verb conjugation
MUST PERDURE

Regular verb: perdure - perdured - perdured

Affirmation

Simple form	V-ing form
I must perdure you must perdure he must perdure we must perdure you must perdure they must perdure	I must be perduring you must be perduring he must be perduring we must be perduring you must be perduring they must be perduring
Perfect	V-ing perfect
I must have perdured you must have perdured he must have perdured we must have perdured you must have perdured they must have perdured	I must have been perduring you must have been perduring he must have been perduring we must have been perduring you must have been perduring they must have been perduring

Negation

Simple form	V-ing form
I mustn't perdure you mustn't perdure he mustn't perdure we mustn't perdure you mustn't perdure they mustn't perdure	I mustn't be perduring you mustn't be perduring he mustn't be perduring we mustn't be perduring you mustn't be perduring they mustn't be perduring
Perfect	V-ing perfect
I mustn't have perdured you mustn't have perdured he mustn't have perdured we mustn't have perdured you mustn't have perdured they mustn't have perdured	I mustn't have been perduring you mustn't have been perduring he mustn't have been perduring we mustn't have been perduring you mustn't have been perduring they mustn't have been perduring

Interrogative form

Simple form	V-ing form
must I perdure? must you perdure? must he perdure? must we perdure? must you perdure? must they perdure?	must I be perduring? must you be perduring? must he be perduring? must we be perduring? must you be perduring? must they be perduring?
Perfect	V-ing perfect
must I have perdured? must you have perdured? must he have perdured? must we have perdured? must you have perdured? must they have perdured?	must I have been perduring? must you have been perduring? must he have been perduring? must we have been perduring? must you have been perduring? must they have been perduring?

Interro-negative form

Simple form	V-ing form
mustn't I perdure? mustn't you perdure? mustn't he perdure? mustn't we perdure? mustn't you perdure? mustn't they perdure?	mustn't I be perduring? mustn't you be perduring? mustn't he be perduring? mustn't we be perduring? mustn't you be perduring? mustn't they be perduring?
Perfect	V-ing perfect
mustn't I have perdured? mustn't you have perdured? mustn't he have perdured? mustn't we have perdured? mustn't you have perdured? mustn't they have perdured?	mustn't I have been perduring? mustn't you have been perduring? mustn't he have been perduring? mustn't we have been perduring? mustn't you have been perduring? mustn't they have been perduring?