I could dent you could dent he could dent we could dent you could dent they could dent
V-ing form
I could be denting you could be denting he could be denting we could be denting you could be denting they could be denting
Perfect
I could have dented you could have dented he 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 he 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 he 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 he 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 he 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 he 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 he dent? could we dent? could you dent? could they dent?
V-ing form
could I be denting? could you be denting? could he be denting? could we be denting? could you be denting? could they be denting?
Perfect
could I have dented? could you have dented? could he 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 he 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 he 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 he 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 he 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 he have been denting? couldn't we have been denting? couldn't you have been denting? couldn't they have been denting?