could close
Regular verb: close - closed- closed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could close
you could close
she could close
we could close
you could close
they could close 	I could be closing
you could be closing
she could be closing
we could be closing
you could be closing
they could be closing	I could have closed
you could have closed
she could have closed
we could have closed
you could have closed
they could have closed	I could have been closing
you could have been closing
she could have been closing
we could have been closing
you could have been closing
they could have been closing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't close
you couldn't close
she couldn't close
we couldn't close
you couldn't close
they couldn't close 	I couldn't be closing
you couldn't be closing
she couldn't be closing
we couldn't be closing
you couldn't be closing
they couldn't be closing	I couldn't have closed
you couldn't have closed
she couldn't have closed
we couldn't have closed
you couldn't have closed
they couldn't have closed	I couldn't have been closing
you couldn't have been closing
she couldn't have been closing
we couldn't have been closing
you couldn't have been closing
they couldn't have been closing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I close?
could you close?
could she close?
could we close?
could you close?
could they close? 	could I be closing?
could you be closing?
could she be closing?
could we be closing?
could you be closing?
could they be closing? 	could I have closed?
could you have closed?
could she have closed?
could we have closed?
could you have closed?
could they have closed? 	could I have been closing?
could you have been closing?
could she have been closing?
could we have been closing?
could you have been closing?
could they have been closing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I close?
couldn't you close?
couldn't she close?
couldn't we close?
couldn't you close?
couldn't they close? 	couldn't I be closing?
couldn't you be closing?
couldn't she be closing?
couldn't we be closing?
couldn't you be closing?
couldn't they be closing? 	couldn't I have closed?
couldn't you have closed?
couldn't she have closed?
couldn't we have closed?
couldn't you have closed?
couldn't they have closed? 	couldn't I have been closing?
couldn't you have been closing?
couldn't she have been closing?
couldn't we have been closing?
couldn't you have been closing?
couldn't they have been closing?