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