I could backslide you could backslide he could backslide we could backslide you could backslide they could backslide
V-ing form
I could be backsliding you could be backsliding he could be backsliding we could be backsliding you could be backsliding they could be backsliding
Perfect
I could have backslid, backslidden you could have backslid, backslidden he could have backslid, backslidden we could have backslid, backslidden you could have backslid, backslidden they could have backslid, backslidden
V-ing perfect
I could have been backsliding you could have been backsliding he could have been backsliding we could have been backsliding you could have been backsliding they could have been backsliding
Negation
Simple form
I could not backslide you could not backslide he could not backslide we could not backslide you could not backslide they could not backslide
V-ing form
I could not be backsliding you could not be backsliding he could not be backsliding we could not be backsliding you could not be backsliding they could not be backsliding
Perfect
I could not have backslid, backslidden you could not have backslid, backslidden he could not have backslid, backslidden we could not have backslid, backslidden you could not have backslid, backslidden they could not have backslid, backslidden
V-ing perfect
I could not have been backsliding you could not have been backsliding he could not have been backsliding we could not have been backsliding you could not have been backsliding they could not have been backsliding
Interrogative form
Simple form
could I backslide? could you backslide? could he backslide? could we backslide? could you backslide? could they backslide?
V-ing form
could I be backsliding? could you be backsliding? could he be backsliding? could we be backsliding? could you be backsliding? could they be backsliding?
Perfect
could I have backslid, backslidden? could you have backslid, backslidden? could he have backslid, backslidden? could we have backslid, backslidden? could you have backslid, backslidden? could they have backslid, backslidden?
V-ing perfect
could I have been backsliding? could you have been backsliding? could he have been backsliding? could we have been backsliding? could you have been backsliding? could they have been backsliding?
Interro-negative form
Simple form
could I not backslide? could you not backslide? could he not backslide? could we not backslide? could you not backslide? could they not backslide?
V-ing form
could I not be backsliding? could you not be backsliding? could he not be backsliding? could we not be backsliding? could you not be backsliding? could they not be backsliding?
Perfect
could I not have backslid, backslidden? could you not have backslid, backslidden? could he not have backslid, backslidden? could we not have backslid, backslidden? could you not have backslid, backslidden? could they not have backslid, backslidden?
V-ing perfect
could I not have been backsliding? could you not have been backsliding? could he not have been backsliding? could we not have been backsliding? could you not have been backsliding? could they not have been backsliding?