could burl
Regular verb: burl - burled- burled

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

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

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

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