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 could not rehab you could not rehab he could not rehab we could not rehab you could not rehab they could not rehab	I could not be rehabing you could not be rehabing he could not be rehabing we could not be rehabing you could not be rehabing they could not be rehabing
Perfect	V-ing perfect
I could not have rehabed you could not have rehabed he could not have rehabed we could not have rehabed you could not have rehabed they could not have rehabed	I could not have been rehabing you could not have been rehabing he could not have been rehabing we could not have been rehabing you could not have been rehabing they could not 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
could I not rehab? could you not rehab? could he not rehab? could we not rehab? could you not rehab? could they not rehab?	could I not be rehabing? could you not be rehabing? could he not be rehabing? could we not be rehabing? could you not be rehabing? could they not be rehabing?
Perfect	V-ing perfect
could I not have rehabed? could you not have rehabed? could he not have rehabed? could we not have rehabed? could you not have rehabed? could they not have rehabed?	could I not have been rehabing? could you not have been rehabing? could he not have been rehabing? could we not have been rehabing? could you not have been rehabing? could they not have been rehabing?