English verb conjugation
COULD SENTINEL

Regular verb: sentinel - sentineled - sentineled

Affirmation

Simple form	V-ing form
I could sentinel you could sentinel he could sentinel we could sentinel you could sentinel they could sentinel	I could be sentineling you could be sentineling he could be sentineling we could be sentineling you could be sentineling they could be sentineling
Perfect	V-ing perfect
I could have sentineled you could have sentineled he could have sentineled we could have sentineled you could have sentineled they could have sentineled	I could have been sentineling you could have been sentineling he could have been sentineling we could have been sentineling you could have been sentineling they could have been sentineling

Negation

Simple form	V-ing form
I could not sentinel you could not sentinel he could not sentinel we could not sentinel you could not sentinel they could not sentinel	I could not be sentineling you could not be sentineling he could not be sentineling we could not be sentineling you could not be sentineling they could not be sentineling
Perfect	V-ing perfect
I could not have sentineled you could not have sentineled he could not have sentineled we could not have sentineled you could not have sentineled they could not have sentineled	I could not have been sentineling you could not have been sentineling he could not have been sentineling we could not have been sentineling you could not have been sentineling they could not have been sentineling

Interrogative form

Simple form	V-ing form
could I sentinel? could you sentinel? could he sentinel? could we sentinel? could you sentinel? could they sentinel?	could I be sentineling? could you be sentineling? could he be sentineling? could we be sentineling? could you be sentineling? could they be sentineling?
Perfect	V-ing perfect
could I have sentineled? could you have sentineled? could he have sentineled? could we have sentineled? could you have sentineled? could they have sentineled?	could I have been sentineling? could you have been sentineling? could he have been sentineling? could we have been sentineling? could you have been sentineling? could they have been sentineling?

Interro-negative form

Simple form	V-ing form
could I not sentinel? could you not sentinel? could he not sentinel? could we not sentinel? could you not sentinel? could they not sentinel?	could I not be sentineling? could you not be sentineling? could he not be sentineling? could we not be sentineling? could you not be sentineling? could they not be sentineling?
Perfect	V-ing perfect
could I not have sentineled? could you not have sentineled? could he not have sentineled? could we not have sentineled? could you not have sentineled? could they not have sentineled?	could I not have been sentineling? could you not have been sentineling? could he not have been sentineling? could we not have been sentineling? could you not have been sentineling? could they not have been sentineling?