English verb conjugation
COULD BURR

Regular verb: burr - burred - burred

Affirmation

Simple form	V-ing form
I could burr you could burr she could burr we could burr you could burr they could burr	I could be burring you could be burring she could be burring we could be burring you could be burring they could be burring
Perfect	V-ing perfect
I could have burred you could have burred she could have burred we could have burred you could have burred they could have burred	I could have been burring you could have been burring she could have been burring we could have been burring you could have been burring they could have been burring

Negation

Simple form	V-ing form
I couldn't burr you couldn't burr she couldn't burr we couldn't burr you couldn't burr they couldn't burr	I couldn't be burring you couldn't be burring she couldn't be burring we couldn't be burring you couldn't be burring they couldn't be burring
Perfect	V-ing perfect
I couldn't have burred you couldn't have burred she couldn't have burred we couldn't have burred you couldn't have burred they couldn't have burred	I couldn't have been burring you couldn't have been burring she couldn't have been burring we couldn't have been burring you couldn't have been burring they couldn't have been burring

Interrogative form

Simple form	V-ing form
could I burr? could you burr? could she burr? could we burr? could you burr? could they burr?	could I be burring? could you be burring? could she be burring? could we be burring? could you be burring? could they be burring?
Perfect	V-ing perfect
could I have burred? could you have burred? could she have burred? could we have burred? could you have burred? could they have burred?	could I have been burring? could you have been burring? could she have been burring? could we have been burring? could you have been burring? could they have been burring?

Interro-negative form

Simple form	V-ing form
couldn't I burr? couldn't you burr? couldn't she burr? couldn't we burr? couldn't you burr? couldn't they burr?	couldn't I be burring? couldn't you be burring? couldn't she be burring? couldn't we be burring? couldn't you be burring? couldn't they be burring?
Perfect	V-ing perfect
couldn't I have burred? couldn't you have burred? couldn't she have burred? couldn't we have burred? couldn't you have burred? couldn't they have burred?	couldn't I have been burring? couldn't you have been burring? couldn't she have been burring? couldn't we have been burring? couldn't you have been burring? couldn't they have been burring?