I could mortgage you could mortgage he could mortgage we could mortgage you could mortgage they could mortgage
V-ing form
I could be mortgaging you could be mortgaging he could be mortgaging we could be mortgaging you could be mortgaging they could be mortgaging
Perfect
I could have mortgaged you could have mortgaged he could have mortgaged we could have mortgaged you could have mortgaged they could have mortgaged
V-ing perfect
I could have been mortgaging you could have been mortgaging he could have been mortgaging we could have been mortgaging you could have been mortgaging they could have been mortgaging
Negation
Simple form
I could not mortgage you could not mortgage he could not mortgage we could not mortgage you could not mortgage they could not mortgage
V-ing form
I could not be mortgaging you could not be mortgaging he could not be mortgaging we could not be mortgaging you could not be mortgaging they could not be mortgaging
Perfect
I could not have mortgaged you could not have mortgaged he could not have mortgaged we could not have mortgaged you could not have mortgaged they could not have mortgaged
V-ing perfect
I could not have been mortgaging you could not have been mortgaging he could not have been mortgaging we could not have been mortgaging you could not have been mortgaging they could not have been mortgaging
Interrogative form
Simple form
could I mortgage? could you mortgage? could he mortgage? could we mortgage? could you mortgage? could they mortgage?
V-ing form
could I be mortgaging? could you be mortgaging? could he be mortgaging? could we be mortgaging? could you be mortgaging? could they be mortgaging?
Perfect
could I have mortgaged? could you have mortgaged? could he have mortgaged? could we have mortgaged? could you have mortgaged? could they have mortgaged?
V-ing perfect
could I have been mortgaging? could you have been mortgaging? could he have been mortgaging? could we have been mortgaging? could you have been mortgaging? could they have been mortgaging?
Interro-negative form
Simple form
could I not mortgage? could you not mortgage? could he not mortgage? could we not mortgage? could you not mortgage? could they not mortgage?
V-ing form
could I not be mortgaging? could you not be mortgaging? could he not be mortgaging? could we not be mortgaging? could you not be mortgaging? could they not be mortgaging?
Perfect
could I not have mortgaged? could you not have mortgaged? could he not have mortgaged? could we not have mortgaged? could you not have mortgaged? could they not have mortgaged?
V-ing perfect
could I not have been mortgaging? could you not have been mortgaging? could he not have been mortgaging? could we not have been mortgaging? could you not have been mortgaging? could they not have been mortgaging?