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 must not jib you must not jib he must not jib we must not jib you must not jib they must not jib	I must not be jibbing you must not be jibbing he must not be jibbing we must not be jibbing you must not be jibbing they must not be jibbing
Perfect	V-ing perfect
I must not have jibbed you must not have jibbed he must not have jibbed we must not have jibbed you must not have jibbed they must not have jibbed	I must not have been jibbing you must not have been jibbing he must not have been jibbing we must not have been jibbing you must not have been jibbing they must not 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
must I not jib? must you not jib? must he not jib? must we not jib? must you not jib? must they not jib?	must I not be jibbing? must you not be jibbing? must he not be jibbing? must we not be jibbing? must you not be jibbing? must they not be jibbing?
Perfect	V-ing perfect
must I not have jibbed? must you not have jibbed? must he not have jibbed? must we not have jibbed? must you not have jibbed? must they not have jibbed?	must I not have been jibbing? must you not have been jibbing? must he not have been jibbing? must we not have been jibbing? must you not have been jibbing? must they not have been jibbing?