could half-open
Regular verb: half-open - half-opened- half-opened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could half-open
you could half-open
she could half-open
we could half-open
you could half-open
they could half-open 	I could be half-opening
you could be half-opening
she could be half-opening
we could be half-opening
you could be half-opening
they could be half-opening	I could have half-opened
you could have half-opened
she could have half-opened
we could have half-opened
you could have half-opened
they could have half-opened	I could have been half-opening
you could have been half-opening
she could have been half-opening
we could have been half-opening
you could have been half-opening
they could have been half-opening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not half-open
you could not half-open
she could not half-open
we could not half-open
you could not half-open
they could not half-open 	I could not be half-opening
you could not be half-opening
she could not be half-opening
we could not be half-opening
you could not be half-opening
they could not be half-opening	I could not have half-opened
you could not have half-opened
she could not have half-opened
we could not have half-opened
you could not have half-opened
they could not have half-opened	I could not have been half-opening
you could not have been half-opening
she could not have been half-opening
we could not have been half-opening
you could not have been half-opening
they could not have been half-opening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I half-open?
could you half-open?
could she half-open?
could we half-open?
could you half-open?
could they half-open? 	could I be half-opening?
could you be half-opening?
could she be half-opening?
could we be half-opening?
could you be half-opening?
could they be half-opening? 	could I have half-opened?
could you have half-opened?
could she have half-opened?
could we have half-opened?
could you have half-opened?
could they have half-opened? 	could I have been half-opening?
could you have been half-opening?
could she have been half-opening?
could we have been half-opening?
could you have been half-opening?
could they have been half-opening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not half-open?
could you not half-open?
could she not half-open?
could we not half-open?
could you not half-open?
could they not half-open? 	could I not be half-opening?
could you not be half-opening?
could she not be half-opening?
could we not be half-opening?
could you not be half-opening?
could they not be half-opening? 	could I not have half-opened?
could you not have half-opened?
could she not have half-opened?
could we not have half-opened?
could you not have half-opened?
could they not have half-opened? 	could I not have been half-opening?
could you not have been half-opening?
could she not have been half-opening?
could we not have been half-opening?
could you not have been half-opening?
could they not have been half-opening?