I could avail you could avail he could avail we could avail you could avail they could avail
V-ing form
I could be availing you could be availing he could be availing we could be availing you could be availing they could be availing
Perfect
I could have availed you could have availed he could have availed we could have availed you could have availed they could have availed
V-ing perfect
I could have been availing you could have been availing he could have been availing we could have been availing you could have been availing they could have been availing
Negation
Simple form
I could not avail you could not avail he could not avail we could not avail you could not avail they could not avail
V-ing form
I could not be availing you could not be availing he could not be availing we could not be availing you could not be availing they could not be availing
Perfect
I could not have availed you could not have availed he could not have availed we could not have availed you could not have availed they could not have availed
V-ing perfect
I could not have been availing you could not have been availing he could not have been availing we could not have been availing you could not have been availing they could not have been availing
Interrogative form
Simple form
could I avail? could you avail? could he avail? could we avail? could you avail? could they avail?
V-ing form
could I be availing? could you be availing? could he be availing? could we be availing? could you be availing? could they be availing?
Perfect
could I have availed? could you have availed? could he have availed? could we have availed? could you have availed? could they have availed?
V-ing perfect
could I have been availing? could you have been availing? could he have been availing? could we have been availing? could you have been availing? could they have been availing?
Interro-negative form
Simple form
could I not avail? could you not avail? could he not avail? could we not avail? could you not avail? could they not avail?
V-ing form
could I not be availing? could you not be availing? could he not be availing? could we not be availing? could you not be availing? could they not be availing?
Perfect
could I not have availed? could you not have availed? could he not have availed? could we not have availed? could you not have availed? could they not have availed?
V-ing perfect
could I not have been availing? could you not have been availing? could he not have been availing? could we not have been availing? could you not have been availing? could they not have been availing?