English verb conjugation
COULD CHASE

Regular verb: chase - chased - chased

Affirmation

Simple form	V-ing form
I could chase you could chase he could chase we could chase you could chase they could chase	I could be chasing you could be chasing he could be chasing we could be chasing you could be chasing they could be chasing
Perfect	V-ing perfect
I could have chased you could have chased he could have chased we could have chased you could have chased they could have chased	I could have been chasing you could have been chasing he could have been chasing we could have been chasing you could have been chasing they could have been chasing

Negation

Simple form	V-ing form
I could not chase you could not chase he could not chase we could not chase you could not chase they could not chase	I could not be chasing you could not be chasing he could not be chasing we could not be chasing you could not be chasing they could not be chasing
Perfect	V-ing perfect
I could not have chased you could not have chased he could not have chased we could not have chased you could not have chased they could not have chased	I could not have been chasing you could not have been chasing he could not have been chasing we could not have been chasing you could not have been chasing they could not have been chasing

Interrogative form

Simple form	V-ing form
could I chase? could you chase? could he chase? could we chase? could you chase? could they chase?	could I be chasing? could you be chasing? could he be chasing? could we be chasing? could you be chasing? could they be chasing?
Perfect	V-ing perfect
could I have chased? could you have chased? could he have chased? could we have chased? could you have chased? could they have chased?	could I have been chasing? could you have been chasing? could he have been chasing? could we have been chasing? could you have been chasing? could they have been chasing?

Interro-negative form

Simple form	V-ing form
could I not chase? could you not chase? could he not chase? could we not chase? could you not chase? could they not chase?	could I not be chasing? could you not be chasing? could he not be chasing? could we not be chasing? could you not be chasing? could they not be chasing?
Perfect	V-ing perfect
could I not have chased? could you not have chased? could he not have chased? could we not have chased? could you not have chased? could they not have chased?	could I not have been chasing? could you not have been chasing? could he not have been chasing? could we not have been chasing? could you not have been chasing? could they not have been chasing?