could burble
Regular verb: burble - burbled- burbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could burble
you could burble
she could burble
we could burble
you could burble
they could burble 	I could be burbling
you could be burbling
she could be burbling
we could be burbling
you could be burbling
they could be burbling	I could have burbled
you could have burbled
she could have burbled
we could have burbled
you could have burbled
they could have burbled	I could have been burbling
you could have been burbling
she could have been burbling
we could have been burbling
you could have been burbling
they could have been burbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't burble
you couldn't burble
she couldn't burble
we couldn't burble
you couldn't burble
they couldn't burble 	I couldn't be burbling
you couldn't be burbling
she couldn't be burbling
we couldn't be burbling
you couldn't be burbling
they couldn't be burbling	I couldn't have burbled
you couldn't have burbled
she couldn't have burbled
we couldn't have burbled
you couldn't have burbled
they couldn't have burbled	I couldn't have been burbling
you couldn't have been burbling
she couldn't have been burbling
we couldn't have been burbling
you couldn't have been burbling
they couldn't have been burbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I burble?
could you burble?
could she burble?
could we burble?
could you burble?
could they burble? 	could I be burbling?
could you be burbling?
could she be burbling?
could we be burbling?
could you be burbling?
could they be burbling? 	could I have burbled?
could you have burbled?
could she have burbled?
could we have burbled?
could you have burbled?
could they have burbled? 	could I have been burbling?
could you have been burbling?
could she have been burbling?
could we have been burbling?
could you have been burbling?
could they have been burbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I burble?
couldn't you burble?
couldn't she burble?
couldn't we burble?
couldn't you burble?
couldn't they burble? 	couldn't I be burbling?
couldn't you be burbling?
couldn't she be burbling?
couldn't we be burbling?
couldn't you be burbling?
couldn't they be burbling? 	couldn't I have burbled?
couldn't you have burbled?
couldn't she have burbled?
couldn't we have burbled?
couldn't you have burbled?
couldn't they have burbled? 	couldn't I have been burbling?
couldn't you have been burbling?
couldn't she have been burbling?
couldn't we have been burbling?
couldn't you have been burbling?
couldn't they have been burbling?