English verb conjugation
MUST GIBE

Regular verb: gibe - gibed - gibed

Affirmation

Simple form	V-ing form
I must gibe you must gibe he must gibe we must gibe you must gibe they must gibe	I must be gibing you must be gibing he must be gibing we must be gibing you must be gibing they must be gibing
Perfect	V-ing perfect
I must have gibed you must have gibed he must have gibed we must have gibed you must have gibed they must have gibed	I must have been gibing you must have been gibing he must have been gibing we must have been gibing you must have been gibing they must have been gibing

Negation

Simple form	V-ing form
I must not gibe you must not gibe he must not gibe we must not gibe you must not gibe they must not gibe	I must not be gibing you must not be gibing he must not be gibing we must not be gibing you must not be gibing they must not be gibing
Perfect	V-ing perfect
I must not have gibed you must not have gibed he must not have gibed we must not have gibed you must not have gibed they must not have gibed	I must not have been gibing you must not have been gibing he must not have been gibing we must not have been gibing you must not have been gibing they must not have been gibing

Interrogative form

Simple form	V-ing form
must I gibe? must you gibe? must he gibe? must we gibe? must you gibe? must they gibe?	must I be gibing? must you be gibing? must he be gibing? must we be gibing? must you be gibing? must they be gibing?
Perfect	V-ing perfect
must I have gibed? must you have gibed? must he have gibed? must we have gibed? must you have gibed? must they have gibed?	must I have been gibing? must you have been gibing? must he have been gibing? must we have been gibing? must you have been gibing? must they have been gibing?

Interro-negative form

Simple form	V-ing form
must I not gibe? must you not gibe? must he not gibe? must we not gibe? must you not gibe? must they not gibe?	must I not be gibing? must you not be gibing? must he not be gibing? must we not be gibing? must you not be gibing? must they not be gibing?
Perfect	V-ing perfect
must I not have gibed? must you not have gibed? must he not have gibed? must we not have gibed? must you not have gibed? must they not have gibed?	must I not have been gibing? must you not have been gibing? must he not have been gibing? must we not have been gibing? must you not have been gibing? must they not have been gibing?