could surround
Regular verb: surround - surrounded- surrounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could surround
you could surround
she could surround
we could surround
you could surround
they could surround 	I could be surrounding
you could be surrounding
she could be surrounding
we could be surrounding
you could be surrounding
they could be surrounding	I could have surrounded
you could have surrounded
she 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
she 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 could not surround
you could not surround
she could not surround
we could not surround
you could not surround
they could not surround 	I could not be surrounding
you could not be surrounding
she could not be surrounding
we could not be surrounding
you could not be surrounding
they could not be surrounding	I could not have surrounded
you could not have surrounded
she could not have surrounded
we could not have surrounded
you could not have surrounded
they could not have surrounded	I could not have been surrounding
you could not have been surrounding
she could not have been surrounding
we could not have been surrounding
you could not have been surrounding
they could not have been surrounding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I surround?
could you surround?
could she surround?
could we surround?
could you surround?
could they surround? 	could I be surrounding?
could you be surrounding?
could she be surrounding?
could we be surrounding?
could you be surrounding?
could they be surrounding? 	could I have surrounded?
could you have surrounded?
could she 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 she 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 	
could I not surround?
could you not surround?
could she not surround?
could we not surround?
could you not surround?
could they not surround? 	could I not be surrounding?
could you not be surrounding?
could she not be surrounding?
could we not be surrounding?
could you not be surrounding?
could they not be surrounding? 	could I not have surrounded?
could you not have surrounded?
could she not have surrounded?
could we not have surrounded?
could you not have surrounded?
could they not have surrounded? 	could I not have been surrounding?
could you not have been surrounding?
could she not have been surrounding?
could we not have been surrounding?
could you not have been surrounding?
could they not have been surrounding?