could surround
Regular verb: surround - surrounded- surrounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could surround
you could surround
he could surround
we could surround
you could surround
they could surround 	I could be surrounding
you could be surrounding
he could be surrounding
we could be surrounding
you could be surrounding
they could be surrounding	I could have surrounded
you could have surrounded
he could have surrounded
we could have surrounded
you could have surrounded
they could have surrounded	I could have been surrounding
you could have been surrounding
he could have been surrounding
we could have been surrounding
you could have been surrounding
they could have been surrounding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't surround
you couldn't surround
he couldn't surround
we couldn't surround
you couldn't surround
they couldn't surround 	I couldn't be surrounding
you couldn't be surrounding
he couldn't be surrounding
we couldn't be surrounding
you couldn't be surrounding
they couldn't be surrounding	I couldn't have surrounded
you couldn't have surrounded
he couldn't have surrounded
we couldn't have surrounded
you couldn't have surrounded
they couldn't have surrounded	I couldn't have been surrounding
you couldn't have been surrounding
he couldn't have been surrounding
we couldn't have been surrounding
you couldn't have been surrounding
they couldn't have been surrounding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I surround?
could you surround?
could he surround?
could we surround?
could you surround?
could they surround? 	could I be surrounding?
could you be surrounding?
could he be surrounding?
could we be surrounding?
could you be surrounding?
could they be surrounding? 	could I have surrounded?
could you have surrounded?
could he have surrounded?
could we have surrounded?
could you have surrounded?
could they have surrounded? 	could I have been surrounding?
could you have been surrounding?
could he have been surrounding?
could we have been surrounding?
could you have been surrounding?
could they have been surrounding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I surround?
couldn't you surround?
couldn't he surround?
couldn't we surround?
couldn't you surround?
couldn't they surround? 	couldn't I be surrounding?
couldn't you be surrounding?
couldn't he be surrounding?
couldn't we be surrounding?
couldn't you be surrounding?
couldn't they be surrounding? 	couldn't I have surrounded?
couldn't you have surrounded?
couldn't he have surrounded?
couldn't we have surrounded?
couldn't you have surrounded?
couldn't they have surrounded? 	couldn't I have been surrounding?
couldn't you have been surrounding?
couldn't he have been surrounding?
couldn't we have been surrounding?
couldn't you have been surrounding?
couldn't they have been surrounding?