English verb conjugation
MUST JIB

Regular verb: jib - jibbed - jibbed

Affirmation

Simple form	V-ing form
I must jib you must jib she must jib we must jib you must jib they must jib	I must be jibbing you must be jibbing she must be jibbing we must be jibbing you must be jibbing they must be jibbing
Perfect	V-ing perfect
I must have jibbed you must have jibbed she must have jibbed we must have jibbed you must have jibbed they must have jibbed	I must have been jibbing you must have been jibbing she must have been jibbing we must have been jibbing you must have been jibbing they must have been jibbing

Negation

Simple form	V-ing form
I mustn't jib you mustn't jib she mustn't jib we mustn't jib you mustn't jib they mustn't jib	I mustn't be jibbing you mustn't be jibbing she mustn't be jibbing we mustn't be jibbing you mustn't be jibbing they mustn't be jibbing
Perfect	V-ing perfect
I mustn't have jibbed you mustn't have jibbed she mustn't have jibbed we mustn't have jibbed you mustn't have jibbed they mustn't have jibbed	I mustn't have been jibbing you mustn't have been jibbing she mustn't have been jibbing we mustn't have been jibbing you mustn't have been jibbing they mustn't have been jibbing

Interrogative form

Simple form	V-ing form
must I jib? must you jib? must she jib? must we jib? must you jib? must they jib?	must I be jibbing? must you be jibbing? must she be jibbing? must we be jibbing? must you be jibbing? must they be jibbing?
Perfect	V-ing perfect
must I have jibbed? must you have jibbed? must she have jibbed? must we have jibbed? must you have jibbed? must they have jibbed?	must I have been jibbing? must you have been jibbing? must she have been jibbing? must we have been jibbing? must you have been jibbing? must they have been jibbing?

Interro-negative form

Simple form	V-ing form
mustn't I jib? mustn't you jib? mustn't she jib? mustn't we jib? mustn't you jib? mustn't they jib?	mustn't I be jibbing? mustn't you be jibbing? mustn't she be jibbing? mustn't we be jibbing? mustn't you be jibbing? mustn't they be jibbing?
Perfect	V-ing perfect
mustn't I have jibbed? mustn't you have jibbed? mustn't she have jibbed? mustn't we have jibbed? mustn't you have jibbed? mustn't they have jibbed?	mustn't I have been jibbing? mustn't you have been jibbing? mustn't she have been jibbing? mustn't we have been jibbing? mustn't you have been jibbing? mustn't they have been jibbing?