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