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