I could dissent you could dissent he could dissent we could dissent you could dissent they could dissent
V-ing form
I could be dissenting you could be dissenting he could be dissenting we could be dissenting you could be dissenting they could be dissenting
Perfect
I could have dissented you could have dissented he could have dissented we could have dissented you could have dissented they could have dissented
V-ing perfect
I could have been dissenting you could have been dissenting he could have been dissenting we could have been dissenting you could have been dissenting they could have been dissenting
Negation
Simple form
I couldn't dissent you couldn't dissent he couldn't dissent we couldn't dissent you couldn't dissent they couldn't dissent
V-ing form
I couldn't be dissenting you couldn't be dissenting he couldn't be dissenting we couldn't be dissenting you couldn't be dissenting they couldn't be dissenting
Perfect
I couldn't have dissented you couldn't have dissented he couldn't have dissented we couldn't have dissented you couldn't have dissented they couldn't have dissented
V-ing perfect
I couldn't have been dissenting you couldn't have been dissenting he couldn't have been dissenting we couldn't have been dissenting you couldn't have been dissenting they couldn't have been dissenting
Interrogative form
Simple form
could I dissent? could you dissent? could he dissent? could we dissent? could you dissent? could they dissent?
V-ing form
could I be dissenting? could you be dissenting? could he be dissenting? could we be dissenting? could you be dissenting? could they be dissenting?
Perfect
could I have dissented? could you have dissented? could he have dissented? could we have dissented? could you have dissented? could they have dissented?
V-ing perfect
could I have been dissenting? could you have been dissenting? could he have been dissenting? could we have been dissenting? could you have been dissenting? could they have been dissenting?
Interro-negative form
Simple form
couldn't I dissent? couldn't you dissent? couldn't he dissent? couldn't we dissent? couldn't you dissent? couldn't they dissent?
V-ing form
couldn't I be dissenting? couldn't you be dissenting? couldn't he be dissenting? couldn't we be dissenting? couldn't you be dissenting? couldn't they be dissenting?
Perfect
couldn't I have dissented? couldn't you have dissented? couldn't he have dissented? couldn't we have dissented? couldn't you have dissented? couldn't they have dissented?
V-ing perfect
couldn't I have been dissenting? couldn't you have been dissenting? couldn't he have been dissenting? couldn't we have been dissenting? couldn't you have been dissenting? couldn't they have been dissenting?