English verb conjugation
MUST CHALLENGE

Regular verb: challenge - challenged - challenged

Affirmation

Simple form	V-ing form
I must challenge you must challenge she must challenge we must challenge you must challenge they must challenge	I must be challenging you must be challenging she must be challenging we must be challenging you must be challenging they must be challenging
Perfect	V-ing perfect
I must have challenged you must have challenged she must have challenged we must have challenged you must have challenged they must have challenged	I must have been challenging you must have been challenging she must have been challenging we must have been challenging you must have been challenging they must have been challenging

Negation

Simple form	V-ing form
I mustn't challenge you mustn't challenge she mustn't challenge we mustn't challenge you mustn't challenge they mustn't challenge	I mustn't be challenging you mustn't be challenging she mustn't be challenging we mustn't be challenging you mustn't be challenging they mustn't be challenging
Perfect	V-ing perfect
I mustn't have challenged you mustn't have challenged she mustn't have challenged we mustn't have challenged you mustn't have challenged they mustn't have challenged	I mustn't have been challenging you mustn't have been challenging she mustn't have been challenging we mustn't have been challenging you mustn't have been challenging they mustn't have been challenging

Interrogative form

Simple form	V-ing form
must I challenge? must you challenge? must she challenge? must we challenge? must you challenge? must they challenge?	must I be challenging? must you be challenging? must she be challenging? must we be challenging? must you be challenging? must they be challenging?
Perfect	V-ing perfect
must I have challenged? must you have challenged? must she have challenged? must we have challenged? must you have challenged? must they have challenged?	must I have been challenging? must you have been challenging? must she have been challenging? must we have been challenging? must you have been challenging? must they have been challenging?

Interro-negative form

Simple form	V-ing form
mustn't I challenge? mustn't you challenge? mustn't she challenge? mustn't we challenge? mustn't you challenge? mustn't they challenge?	mustn't I be challenging? mustn't you be challenging? mustn't she be challenging? mustn't we be challenging? mustn't you be challenging? mustn't they be challenging?
Perfect	V-ing perfect
mustn't I have challenged? mustn't you have challenged? mustn't she have challenged? mustn't we have challenged? mustn't you have challenged? mustn't they have challenged?	mustn't I have been challenging? mustn't you have been challenging? mustn't she have been challenging? mustn't we have been challenging? mustn't you have been challenging? mustn't they have been challenging?