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