English verb conjugation
CAN CONFAB

Regular verb: confab - confabed - confabed

Affirmation

Simple form	V-ing form
I can confab you can confab he can confab we can confab you can confab they can confab	I can be confabing you can be confabing he can be confabing we can be confabing you can be confabing they can be confabing
Perfect	V-ing perfect
I can have confabed you can have confabed he can have confabed we can have confabed you can have confabed they can have confabed	I can have been confabing you can have been confabing he can have been confabing we can have been confabing you can have been confabing they can have been confabing

Negation

Simple form	V-ing form
I can't confab you can't confab he can't confab we can't confab you can't confab they can't confab	I can't be confabing you can't be confabing he can't be confabing we can't be confabing you can't be confabing they can't be confabing
Perfect	V-ing perfect
I can't have confabed you can't have confabed he can't have confabed we can't have confabed you can't have confabed they can't have confabed	I can't have been confabing you can't have been confabing he can't have been confabing we can't have been confabing you can't have been confabing they can't have been confabing

Interrogative form

Simple form	V-ing form
can I confab? can you confab? can he confab? can we confab? can you confab? can they confab?	can I be confabing? can you be confabing? can he be confabing? can we be confabing? can you be confabing? can they be confabing?
Perfect	V-ing perfect
can I have confabed? can you have confabed? can he have confabed? can we have confabed? can you have confabed? can they have confabed?	can I have been confabing? can you have been confabing? can he have been confabing? can we have been confabing? can you have been confabing? can they have been confabing?

Interro-negative form

Simple form	V-ing form
can't I confab? can't you confab? can't he confab? can't we confab? can't you confab? can't they confab?	can't I be confabing? can't you be confabing? can't he be confabing? can't we be confabing? can't you be confabing? can't they be confabing?
Perfect	V-ing perfect
can't I have confabed? can't you have confabed? can't he have confabed? can't we have confabed? can't you have confabed? can't they have confabed?	can't I have been confabing? can't you have been confabing? can't he have been confabing? can't we have been confabing? can't you have been confabing? can't they have been confabing?