I could berry you could berry she could berry we could berry you could berry they could berry
V-ing form
I could be berrying you could be berrying she could be berrying we could be berrying you could be berrying they could be berrying
Perfect
I could have berried you could have berried she 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 she could have been berrying we could have been berrying you could have been berrying they could have been berrying
Negation
Simple form
I couldn't berry you couldn't berry she couldn't berry we couldn't berry you couldn't berry they couldn't berry
V-ing form
I couldn't be berrying you couldn't be berrying she couldn't be berrying we couldn't be berrying you couldn't be berrying they couldn't be berrying
Perfect
I couldn't have berried you couldn't have berried she couldn't have berried we couldn't have berried you couldn't have berried they couldn't have berried
V-ing perfect
I couldn't have been berrying you couldn't have been berrying she couldn't have been berrying we couldn't have been berrying you couldn't have been berrying they couldn't have been berrying
Interrogative form
Simple form
could I berry? could you berry? could she berry? could we berry? could you berry? could they berry?
V-ing form
could I be berrying? could you be berrying? could she be berrying? could we be berrying? could you be berrying? could they be berrying?
Perfect
could I have berried? could you have berried? could she 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 she have been berrying? could we have been berrying? could you have been berrying? could they have been berrying?
Interro-negative form
Simple form
couldn't I berry? couldn't you berry? couldn't she berry? couldn't we berry? couldn't you berry? couldn't they berry?
V-ing form
couldn't I be berrying? couldn't you be berrying? couldn't she be berrying? couldn't we be berrying? couldn't you be berrying? couldn't they be berrying?
Perfect
couldn't I have berried? couldn't you have berried? couldn't she have berried? couldn't we have berried? couldn't you have berried? couldn't they have berried?
V-ing perfect
couldn't I have been berrying? couldn't you have been berrying? couldn't she have been berrying? couldn't we have been berrying? couldn't you have been berrying? couldn't they have been berrying?