English verb conjugation
COULD PREFAB

Regular verb: prefab - prefabed - prefabed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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