could bur
Regular verb: bur - bured- bured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bur
you could bur
she could bur
we could bur
you could bur
they could bur 	I could be buring
you could be buring
she could be buring
we could be buring
you could be buring
they could be buring	I could have bured
you could have bured
she could have bured
we could have bured
you could have bured
they could have bured	I could have been buring
you could have been buring
she could have been buring
we could have been buring
you could have been buring
they could have been buring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bur
you couldn't bur
she couldn't bur
we couldn't bur
you couldn't bur
they couldn't bur 	I couldn't be buring
you couldn't be buring
she couldn't be buring
we couldn't be buring
you couldn't be buring
they couldn't be buring	I couldn't have bured
you couldn't have bured
she couldn't have bured
we couldn't have bured
you couldn't have bured
they couldn't have bured	I couldn't have been buring
you couldn't have been buring
she couldn't have been buring
we couldn't have been buring
you couldn't have been buring
they couldn't have been buring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I bur?
could you bur?
could she bur?
could we bur?
could you bur?
could they bur? 	could I be buring?
could you be buring?
could she be buring?
could we be buring?
could you be buring?
could they be buring? 	could I have bured?
could you have bured?
could she have bured?
could we have bured?
could you have bured?
could they have bured? 	could I have been buring?
could you have been buring?
could she have been buring?
could we have been buring?
could you have been buring?
could they have been buring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I bur?
couldn't you bur?
couldn't she bur?
couldn't we bur?
couldn't you bur?
couldn't they bur? 	couldn't I be buring?
couldn't you be buring?
couldn't she be buring?
couldn't we be buring?
couldn't you be buring?
couldn't they be buring? 	couldn't I have bured?
couldn't you have bured?
couldn't she have bured?
couldn't we have bured?
couldn't you have bured?
couldn't they have bured? 	couldn't I have been buring?
couldn't you have been buring?
couldn't she have been buring?
couldn't we have been buring?
couldn't you have been buring?
couldn't they have been buring?