Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could be be you could be be he could be be we could be be you could be be they could be be
V-ing form
I could be be bing you could be be bing he could be be bing we could be be bing you could be be bing they could be be bing
Perfect
I could have be bed you could have be bed he could have be bed we could have be bed you could have be bed they could have be bed
V-ing perfect
I could have been be bing you could have been be bing he could have been be bing we could have been be bing you could have been be bing they could have been be bing
Negation
Simple form
I could not be be you could not be be he could not be be we could not be be you could not be be they could not be be
V-ing form
I could not be be bing you could not be be bing he could not be be bing we could not be be bing you could not be be bing they could not be be bing
Perfect
I could not have be bed you could not have be bed he could not have be bed we could not have be bed you could not have be bed they could not have be bed
V-ing perfect
I could not have been be bing you could not have been be bing he could not have been be bing we could not have been be bing you could not have been be bing they could not have been be bing
Interrogative form
Simple form
could I be be? could you be be? could he be be? could we be be? could you be be? could they be be?
V-ing form
could I be be bing? could you be be bing? could he be be bing? could we be be bing? could you be be bing? could they be be bing?
Perfect
could I have be bed? could you have be bed? could he have be bed? could we have be bed? could you have be bed? could they have be bed?
V-ing perfect
could I have been be bing? could you have been be bing? could he have been be bing? could we have been be bing? could you have been be bing? could they have been be bing?
Interro-negative form
Simple form
could I not be be? could you not be be? could he not be be? could we not be be? could you not be be? could they not be be?
V-ing form
could I not be be bing? could you not be be bing? could he not be be bing? could we not be be bing? could you not be be bing? could they not be be bing?
Perfect
could I not have be bed? could you not have be bed? could he not have be bed? could we not have be bed? could you not have be bed? could they not have be bed?
V-ing perfect
could I not have been be bing? could you not have been be bing? could he not have been be bing? could we not have been be bing? could you not have been be bing? could they not have been be bing?