English verb conjugation
MUST PERDURE

Regular verb: perdure - perdured - perdured

Affirmation

Simple form	V-ing form
I must perdure you must perdure she must perdure we must perdure you must perdure they must perdure	I must be perduring you must be perduring she 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 she 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 she 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 she 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 she 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 she 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 she 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 she perdure? must we perdure? must you perdure? must they perdure?	must I be perduring? must you be perduring? must she 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 she 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 she 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 she 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 she 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 she 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 she have been perduring? mustn't we have been perduring? mustn't you have been perduring? mustn't they have been perduring?