I could dent you could dent she could dent we could dent you could dent they could dent
V-ing form
I could be denting you could be denting she could be denting we could be denting you could be denting they could be denting
Perfect
I could have dented you could have dented she could have dented we could have dented you could have dented they could have dented
V-ing perfect
I could have been denting you could have been denting she could have been denting we could have been denting you could have been denting they could have been denting
Negation
Simple form
I couldn't dent you couldn't dent she couldn't dent we couldn't dent you couldn't dent they couldn't dent
V-ing form
I couldn't be denting you couldn't be denting she couldn't be denting we couldn't be denting you couldn't be denting they couldn't be denting
Perfect
I couldn't have dented you couldn't have dented she couldn't have dented we couldn't have dented you couldn't have dented they couldn't have dented
V-ing perfect
I couldn't have been denting you couldn't have been denting she couldn't have been denting we couldn't have been denting you couldn't have been denting they couldn't have been denting
Interrogative form
Simple form
could I dent? could you dent? could she dent? could we dent? could you dent? could they dent?
V-ing form
could I be denting? could you be denting? could she be denting? could we be denting? could you be denting? could they be denting?
Perfect
could I have dented? could you have dented? could she have dented? could we have dented? could you have dented? could they have dented?
V-ing perfect
could I have been denting? could you have been denting? could she have been denting? could we have been denting? could you have been denting? could they have been denting?
Interro-negative form
Simple form
couldn't I dent? couldn't you dent? couldn't she dent? couldn't we dent? couldn't you dent? couldn't they dent?
V-ing form
couldn't I be denting? couldn't you be denting? couldn't she be denting? couldn't we be denting? couldn't you be denting? couldn't they be denting?
Perfect
couldn't I have dented? couldn't you have dented? couldn't she have dented? couldn't we have dented? couldn't you have dented? couldn't they have dented?
V-ing perfect
couldn't I have been denting? couldn't you have been denting? couldn't she have been denting? couldn't we have been denting? couldn't you have been denting? couldn't they have been denting?