I could windrow you could windrow he could windrow we could windrow you could windrow they could windrow
V-ing form
I could be windrowing you could be windrowing he could be windrowing we could be windrowing you could be windrowing they could be windrowing
Perfect
I could have windrowed you could have windrowed he could have windrowed we could have windrowed you could have windrowed they could have windrowed
V-ing perfect
I could have been windrowing you could have been windrowing he could have been windrowing we could have been windrowing you could have been windrowing they could have been windrowing
Negation
Simple form
I could not windrow you could not windrow he could not windrow we could not windrow you could not windrow they could not windrow
V-ing form
I could not be windrowing you could not be windrowing he could not be windrowing we could not be windrowing you could not be windrowing they could not be windrowing
Perfect
I could not have windrowed you could not have windrowed he could not have windrowed we could not have windrowed you could not have windrowed they could not have windrowed
V-ing perfect
I could not have been windrowing you could not have been windrowing he could not have been windrowing we could not have been windrowing you could not have been windrowing they could not have been windrowing
Interrogative form
Simple form
could I windrow? could you windrow? could he windrow? could we windrow? could you windrow? could they windrow?
V-ing form
could I be windrowing? could you be windrowing? could he be windrowing? could we be windrowing? could you be windrowing? could they be windrowing?
Perfect
could I have windrowed? could you have windrowed? could he have windrowed? could we have windrowed? could you have windrowed? could they have windrowed?
V-ing perfect
could I have been windrowing? could you have been windrowing? could he have been windrowing? could we have been windrowing? could you have been windrowing? could they have been windrowing?
Interro-negative form
Simple form
could I not windrow? could you not windrow? could he not windrow? could we not windrow? could you not windrow? could they not windrow?
V-ing form
could I not be windrowing? could you not be windrowing? could he not be windrowing? could we not be windrowing? could you not be windrowing? could they not be windrowing?
Perfect
could I not have windrowed? could you not have windrowed? could he not have windrowed? could we not have windrowed? could you not have windrowed? could they not have windrowed?
V-ing perfect
could I not have been windrowing? could you not have been windrowing? could he not have been windrowing? could we not have been windrowing? could you not have been windrowing? could they not have been windrowing?