English verb conjugation
MUST JIB

Regular verb: jib - jibbed - jibbed

Affirmation

Simple form	V-ing form
I must jib you must jib he must jib we must jib you must jib they must jib	I must be jibbing you must be jibbing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he jib? must we jib? must you jib? must they jib?	must I be jibbing? must you be jibbing? must he 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 he 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 he 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 he 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 he 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 he 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 he have been jibbing? mustn't we have been jibbing? mustn't you have been jibbing? mustn't they have been jibbing?