English verb conjugation
MUST PREFAB

Regular verb: prefab - prefabed - prefabed

Affirmation

Simple form	V-ing form
I must prefab you must prefab he must prefab we must prefab you must prefab they must prefab	I must be prefabing you must be prefabing he must be prefabing we must be prefabing you must be prefabing they must be prefabing
Perfect	V-ing perfect
I must have prefabed you must have prefabed he must have prefabed we must have prefabed you must have prefabed they must have prefabed	I must have been prefabing you must have been prefabing he must have been prefabing we must have been prefabing you must have been prefabing they must have been prefabing

Negation

Simple form	V-ing form
I mustn't prefab you mustn't prefab he mustn't prefab we mustn't prefab you mustn't prefab they mustn't prefab	I mustn't be prefabing you mustn't be prefabing he mustn't be prefabing we mustn't be prefabing you mustn't be prefabing they mustn't be prefabing
Perfect	V-ing perfect
I mustn't have prefabed you mustn't have prefabed he mustn't have prefabed we mustn't have prefabed you mustn't have prefabed they mustn't have prefabed	I mustn't have been prefabing you mustn't have been prefabing he mustn't have been prefabing we mustn't have been prefabing you mustn't have been prefabing they mustn't have been prefabing

Interrogative form

Simple form	V-ing form
must I prefab? must you prefab? must he prefab? must we prefab? must you prefab? must they prefab?	must I be prefabing? must you be prefabing? must he be prefabing? must we be prefabing? must you be prefabing? must they be prefabing?
Perfect	V-ing perfect
must I have prefabed? must you have prefabed? must he have prefabed? must we have prefabed? must you have prefabed? must they have prefabed?	must I have been prefabing? must you have been prefabing? must he have been prefabing? must we have been prefabing? must you have been prefabing? must they have been prefabing?

Interro-negative form

Simple form	V-ing form
mustn't I prefab? mustn't you prefab? mustn't he prefab? mustn't we prefab? mustn't you prefab? mustn't they prefab?	mustn't I be prefabing? mustn't you be prefabing? mustn't he be prefabing? mustn't we be prefabing? mustn't you be prefabing? mustn't they be prefabing?
Perfect	V-ing perfect
mustn't I have prefabed? mustn't you have prefabed? mustn't he have prefabed? mustn't we have prefabed? mustn't you have prefabed? mustn't they have prefabed?	mustn't I have been prefabing? mustn't you have been prefabing? mustn't he have been prefabing? mustn't we have been prefabing? mustn't you have been prefabing? mustn't they have been prefabing?