English verb conjugation
COULD SENTINEL

Regular verb: sentinel - sentineled - sentineled

Affirmation

Simple form	V-ing form
I could sentinel you could sentinel she could sentinel we could sentinel you could sentinel they could sentinel	I could be sentineling you could be sentineling she 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 she 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 she 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 couldn't sentinel you couldn't sentinel she couldn't sentinel we couldn't sentinel you couldn't sentinel they couldn't sentinel	I couldn't be sentineling you couldn't be sentineling she couldn't be sentineling we couldn't be sentineling you couldn't be sentineling they couldn't be sentineling
Perfect	V-ing perfect
I couldn't have sentineled you couldn't have sentineled she couldn't have sentineled we couldn't have sentineled you couldn't have sentineled they couldn't have sentineled	I couldn't have been sentineling you couldn't have been sentineling she couldn't have been sentineling we couldn't have been sentineling you couldn't have been sentineling they couldn't have been sentineling

Interrogative form

Simple form	V-ing form
could I sentinel? could you sentinel? could she sentinel? could we sentinel? could you sentinel? could they sentinel?	could I be sentineling? could you be sentineling? could she 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 she 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 she 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
couldn't I sentinel? couldn't you sentinel? couldn't she sentinel? couldn't we sentinel? couldn't you sentinel? couldn't they sentinel?	couldn't I be sentineling? couldn't you be sentineling? couldn't she be sentineling? couldn't we be sentineling? couldn't you be sentineling? couldn't they be sentineling?
Perfect	V-ing perfect
couldn't I have sentineled? couldn't you have sentineled? couldn't she have sentineled? couldn't we have sentineled? couldn't you have sentineled? couldn't they have sentineled?	couldn't I have been sentineling? couldn't you have been sentineling? couldn't she have been sentineling? couldn't we have been sentineling? couldn't you have been sentineling? couldn't they have been sentineling?