could be
Irregular verb: be - was/were- been

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could be
you could be
he could be
we could be
you could be
they could be 	I could be being
you could be being
he could be being
we could be being
you could be being
they could be being	I could have been
you could have been
he could have been
we could have been
you could have been
they could have been	I could have been being
you could have been being
he could have been being
we could have been being
you could have been being
they could have been being	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't be
you couldn't be
he couldn't be
we couldn't be
you couldn't be
they couldn't be 	I couldn't be being
you couldn't be being
he couldn't be being
we couldn't be being
you couldn't be being
they couldn't be being	I couldn't have been
you couldn't have been
he couldn't have been
we couldn't have been
you couldn't have been
they couldn't have been	I couldn't have been being
you couldn't have been being
he couldn't have been being
we couldn't have been being
you couldn't have been being
they couldn't have been being	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I be?
could you be?
could he be?
could we be?
could you be?
could they be? 	could I be being?
could you be being?
could he be being?
could we be being?
could you be being?
could they be being? 	could I have been?
could you have been?
could he have been?
could we have been?
could you have been?
could they have been? 	could I have been being?
could you have been being?
could he have been being?
could we have been being?
could you have been being?
could they have been being? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I be?
couldn't you be?
couldn't he be?
couldn't we be?
couldn't you be?
couldn't they be? 	couldn't I be being?
couldn't you be being?
couldn't he be being?
couldn't we be being?
couldn't you be being?
couldn't they be being? 	couldn't I have been?
couldn't you have been?
couldn't he have been?
couldn't we have been?
couldn't you have been?
couldn't they have been? 	couldn't I have been being?
couldn't you have been being?
couldn't he have been being?
couldn't we have been being?
couldn't you have been being?
couldn't they have been being?