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 couldn't be be you couldn't be be he couldn't be be we couldn't be be you couldn't be be they couldn't be be
V-ing form
I couldn't be be bing you couldn't be be bing he couldn't be be bing we couldn't be be bing you couldn't be be bing they couldn't be be bing
Perfect
I couldn't have be bed you couldn't have be bed he couldn't have be bed we couldn't have be bed you couldn't have be bed they couldn't have be bed
V-ing perfect
I couldn't have been be bing you couldn't have been be bing he couldn't have been be bing we couldn't have been be bing you couldn't have been be bing they couldn't 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
couldn't I be be? couldn't you be be? couldn't he be be? couldn't we be be? couldn't you be be? couldn't they be be?
V-ing form
couldn't I be be bing? couldn't you be be bing? couldn't he be be bing? couldn't we be be bing? couldn't you be be bing? couldn't they be be bing?
Perfect
couldn't I have be bed? couldn't you have be bed? couldn't he have be bed? couldn't we have be bed? couldn't you have be bed? couldn't they have be bed?
V-ing perfect
couldn't I have been be bing? couldn't you have been be bing? couldn't he have been be bing? couldn't we have been be bing? couldn't you have been be bing? couldn't they have been be bing?