I could berry you could berry he could berry we could berry you could berry they could berry
V-ing form
I could be berrying you could be berrying he could be berrying we could be berrying you could be berrying they could be berrying
Perfect
I could have berried you could have berried he could have berried we could have berried you could have berried they could have berried
V-ing perfect
I could have been berrying you could have been berrying he could have been berrying we could have been berrying you could have been berrying they could have been berrying
Negation
Simple form
I could not berry you could not berry he could not berry we could not berry you could not berry they could not berry
V-ing form
I could not be berrying you could not be berrying he could not be berrying we could not be berrying you could not be berrying they could not be berrying
Perfect
I could not have berried you could not have berried he could not have berried we could not have berried you could not have berried they could not have berried
V-ing perfect
I could not have been berrying you could not have been berrying he could not have been berrying we could not have been berrying you could not have been berrying they could not have been berrying
Interrogative form
Simple form
could I berry? could you berry? could he berry? could we berry? could you berry? could they berry?
V-ing form
could I be berrying? could you be berrying? could he be berrying? could we be berrying? could you be berrying? could they be berrying?
Perfect
could I have berried? could you have berried? could he have berried? could we have berried? could you have berried? could they have berried?
V-ing perfect
could I have been berrying? could you have been berrying? could he have been berrying? could we have been berrying? could you have been berrying? could they have been berrying?
Interro-negative form
Simple form
could I not berry? could you not berry? could he not berry? could we not berry? could you not berry? could they not berry?
V-ing form
could I not be berrying? could you not be berrying? could he not be berrying? could we not be berrying? could you not be berrying? could they not be berrying?
Perfect
could I not have berried? could you not have berried? could he not have berried? could we not have berried? could you not have berried? could they not have berried?
V-ing perfect
could I not have been berrying? could you not have been berrying? could he not have been berrying? could we not have been berrying? could you not have been berrying? could they not have been berrying?