could burrow
Regular verb: burrow - burrowed- burrowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could burrow
you could burrow
she could burrow
we could burrow
you could burrow
they could burrow 	I could be burrowing
you could be burrowing
she could be burrowing
we could be burrowing
you could be burrowing
they could be burrowing	I could have burrowed
you could have burrowed
she could have burrowed
we could have burrowed
you could have burrowed
they could have burrowed	I could have been burrowing
you could have been burrowing
she could have been burrowing
we could have been burrowing
you could have been burrowing
they could have been burrowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't burrow
you couldn't burrow
she couldn't burrow
we couldn't burrow
you couldn't burrow
they couldn't burrow 	I couldn't be burrowing
you couldn't be burrowing
she couldn't be burrowing
we couldn't be burrowing
you couldn't be burrowing
they couldn't be burrowing	I couldn't have burrowed
you couldn't have burrowed
she couldn't have burrowed
we couldn't have burrowed
you couldn't have burrowed
they couldn't have burrowed	I couldn't have been burrowing
you couldn't have been burrowing
she couldn't have been burrowing
we couldn't have been burrowing
you couldn't have been burrowing
they couldn't have been burrowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I burrow?
could you burrow?
could she burrow?
could we burrow?
could you burrow?
could they burrow? 	could I be burrowing?
could you be burrowing?
could she be burrowing?
could we be burrowing?
could you be burrowing?
could they be burrowing? 	could I have burrowed?
could you have burrowed?
could she have burrowed?
could we have burrowed?
could you have burrowed?
could they have burrowed? 	could I have been burrowing?
could you have been burrowing?
could she have been burrowing?
could we have been burrowing?
could you have been burrowing?
could they have been burrowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I burrow?
couldn't you burrow?
couldn't she burrow?
couldn't we burrow?
couldn't you burrow?
couldn't they burrow? 	couldn't I be burrowing?
couldn't you be burrowing?
couldn't she be burrowing?
couldn't we be burrowing?
couldn't you be burrowing?
couldn't they be burrowing? 	couldn't I have burrowed?
couldn't you have burrowed?
couldn't she have burrowed?
couldn't we have burrowed?
couldn't you have burrowed?
couldn't they have burrowed? 	couldn't I have been burrowing?
couldn't you have been burrowing?
couldn't she have been burrowing?
couldn't we have been burrowing?
couldn't you have been burrowing?
couldn't they have been burrowing?