English verb conjugation
COULD REHAB

Regular verb: rehab - rehabed - rehabed

Affirmation

Simple form	V-ing form
I could rehab you could rehab he could rehab we could rehab you could rehab they could rehab	I could be rehabing you could be rehabing he could be rehabing we could be rehabing you could be rehabing they could be rehabing
Perfect	V-ing perfect
I could have rehabed you could have rehabed he could have rehabed we could have rehabed you could have rehabed they could have rehabed	I could have been rehabing you could have been rehabing he could have been rehabing we could have been rehabing you could have been rehabing they could have been rehabing

Negation

Simple form	V-ing form
I couldn't rehab you couldn't rehab he couldn't rehab we couldn't rehab you couldn't rehab they couldn't rehab	I couldn't be rehabing you couldn't be rehabing he couldn't be rehabing we couldn't be rehabing you couldn't be rehabing they couldn't be rehabing
Perfect	V-ing perfect
I couldn't have rehabed you couldn't have rehabed he couldn't have rehabed we couldn't have rehabed you couldn't have rehabed they couldn't have rehabed	I couldn't have been rehabing you couldn't have been rehabing he couldn't have been rehabing we couldn't have been rehabing you couldn't have been rehabing they couldn't have been rehabing

Interrogative form

Simple form	V-ing form
could I rehab? could you rehab? could he rehab? could we rehab? could you rehab? could they rehab?	could I be rehabing? could you be rehabing? could he be rehabing? could we be rehabing? could you be rehabing? could they be rehabing?
Perfect	V-ing perfect
could I have rehabed? could you have rehabed? could he have rehabed? could we have rehabed? could you have rehabed? could they have rehabed?	could I have been rehabing? could you have been rehabing? could he have been rehabing? could we have been rehabing? could you have been rehabing? could they have been rehabing?

Interro-negative form

Simple form	V-ing form
couldn't I rehab? couldn't you rehab? couldn't he rehab? couldn't we rehab? couldn't you rehab? couldn't they rehab?	couldn't I be rehabing? couldn't you be rehabing? couldn't he be rehabing? couldn't we be rehabing? couldn't you be rehabing? couldn't they be rehabing?
Perfect	V-ing perfect
couldn't I have rehabed? couldn't you have rehabed? couldn't he have rehabed? couldn't we have rehabed? couldn't you have rehabed? couldn't they have rehabed?	couldn't I have been rehabing? couldn't you have been rehabing? couldn't he have been rehabing? couldn't we have been rehabing? couldn't you have been rehabing? couldn't they have been rehabing?