could bib
Regular verb: bib - bibed- bibed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bib
you could bib
she could bib
we could bib
you could bib
they could bib 	I could be bibing
you could be bibing
she could be bibing
we could be bibing
you could be bibing
they could be bibing	I could have bibed
you could have bibed
she could have bibed
we could have bibed
you could have bibed
they could have bibed	I could have been bibing
you could have been bibing
she could have been bibing
we could have been bibing
you could have been bibing
they could have been bibing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bib
you couldn't bib
she couldn't bib
we couldn't bib
you couldn't bib
they couldn't bib 	I couldn't be bibing
you couldn't be bibing
she couldn't be bibing
we couldn't be bibing
you couldn't be bibing
they couldn't be bibing	I couldn't have bibed
you couldn't have bibed
she couldn't have bibed
we couldn't have bibed
you couldn't have bibed
they couldn't have bibed	I couldn't have been bibing
you couldn't have been bibing
she couldn't have been bibing
we couldn't have been bibing
you couldn't have been bibing
they couldn't have been bibing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I bib?
could you bib?
could she bib?
could we bib?
could you bib?
could they bib? 	could I be bibing?
could you be bibing?
could she be bibing?
could we be bibing?
could you be bibing?
could they be bibing? 	could I have bibed?
could you have bibed?
could she have bibed?
could we have bibed?
could you have bibed?
could they have bibed? 	could I have been bibing?
could you have been bibing?
could she have been bibing?
could we have been bibing?
could you have been bibing?
could they have been bibing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I bib?
couldn't you bib?
couldn't she bib?
couldn't we bib?
couldn't you bib?
couldn't they bib? 	couldn't I be bibing?
couldn't you be bibing?
couldn't she be bibing?
couldn't we be bibing?
couldn't you be bibing?
couldn't they be bibing? 	couldn't I have bibed?
couldn't you have bibed?
couldn't she have bibed?
couldn't we have bibed?
couldn't you have bibed?
couldn't they have bibed? 	couldn't I have been bibing?
couldn't you have been bibing?
couldn't she have been bibing?
couldn't we have been bibing?
couldn't you have been bibing?
couldn't they have been bibing?