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