could sight
Regular verb: sight - sighted- sighted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sight
you could sight
she could sight
we could sight
you could sight
they could sight 	I could be sighting
you could be sighting
she could be sighting
we could be sighting
you could be sighting
they could be sighting	I could have sighted
you could have sighted
she could have sighted
we could have sighted
you could have sighted
they could have sighted	I could have been sighting
you could have been sighting
she could have been sighting
we could have been sighting
you could have been sighting
they could have been sighting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sight
you could not sight
she could not sight
we could not sight
you could not sight
they could not sight 	I could not be sighting
you could not be sighting
she could not be sighting
we could not be sighting
you could not be sighting
they could not be sighting	I could not have sighted
you could not have sighted
she could not have sighted
we could not have sighted
you could not have sighted
they could not have sighted	I could not have been sighting
you could not have been sighting
she could not have been sighting
we could not have been sighting
you could not have been sighting
they could not have been sighting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sight?
could you sight?
could she sight?
could we sight?
could you sight?
could they sight? 	could I be sighting?
could you be sighting?
could she be sighting?
could we be sighting?
could you be sighting?
could they be sighting? 	could I have sighted?
could you have sighted?
could she have sighted?
could we have sighted?
could you have sighted?
could they have sighted? 	could I have been sighting?
could you have been sighting?
could she have been sighting?
could we have been sighting?
could you have been sighting?
could they have been sighting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sight?
could you not sight?
could she not sight?
could we not sight?
could you not sight?
could they not sight? 	could I not be sighting?
could you not be sighting?
could she not be sighting?
could we not be sighting?
could you not be sighting?
could they not be sighting? 	could I not have sighted?
could you not have sighted?
could she not have sighted?
could we not have sighted?
could you not have sighted?
could they not have sighted? 	could I not have been sighting?
could you not have been sighting?
could she not have been sighting?
could we not have been sighting?
could you not have been sighting?
could they not have been sighting?