English verb conjugation
COULD SIGHT

Regular verb: sight - sighted - sighted

Affirmation

Simple form	V-ing form
I could sight you could sight he could sight we could sight you could sight they could sight	I could be sighting you could be sighting he could be sighting we could be sighting you could be sighting they could be sighting
Perfect	V-ing perfect
I could have sighted you could have sighted he 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 he 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
I couldn't sight you couldn't sight he couldn't sight we couldn't sight you couldn't sight they couldn't sight	I couldn't be sighting you couldn't be sighting he couldn't be sighting we couldn't be sighting you couldn't be sighting they couldn't be sighting
Perfect	V-ing perfect
I couldn't have sighted you couldn't have sighted he couldn't have sighted we couldn't have sighted you couldn't have sighted they couldn't have sighted	I couldn't have been sighting you couldn't have been sighting he couldn't have been sighting we couldn't have been sighting you couldn't have been sighting they couldn't have been sighting

Interrogative form

Simple form	V-ing form
could I sight? could you sight? could he sight? could we sight? could you sight? could they sight?	could I be sighting? could you be sighting? could he be sighting? could we be sighting? could you be sighting? could they be sighting?
Perfect	V-ing perfect
could I have sighted? could you have sighted? could he 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 he 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
couldn't I sight? couldn't you sight? couldn't he sight? couldn't we sight? couldn't you sight? couldn't they sight?	couldn't I be sighting? couldn't you be sighting? couldn't he be sighting? couldn't we be sighting? couldn't you be sighting? couldn't they be sighting?
Perfect	V-ing perfect
couldn't I have sighted? couldn't you have sighted? couldn't he have sighted? couldn't we have sighted? couldn't you have sighted? couldn't they have sighted?	couldn't I have been sighting? couldn't you have been sighting? couldn't he have been sighting? couldn't we have been sighting? couldn't you have been sighting? couldn't they have been sighting?