English verb conjugation
COULD TIME

Regular verb: time - timed - timed

Affirmation

Simple form	V-ing form
I could time you could time she could time we could time you could time they could time	I could be timing you could be timing she could be timing we could be timing you could be timing they could be timing
Perfect	V-ing perfect
I could have timed you could have timed she could have timed we could have timed you could have timed they could have timed	I could have been timing you could have been timing she could have been timing we could have been timing you could have been timing they could have been timing

Negation

Simple form	V-ing form
I could not time you could not time she could not time we could not time you could not time they could not time	I could not be timing you could not be timing she could not be timing we could not be timing you could not be timing they could not be timing
Perfect	V-ing perfect
I could not have timed you could not have timed she could not have timed we could not have timed you could not have timed they could not have timed	I could not have been timing you could not have been timing she could not have been timing we could not have been timing you could not have been timing they could not have been timing

Interrogative form

Simple form	V-ing form
could I time? could you time? could she time? could we time? could you time? could they time?	could I be timing? could you be timing? could she be timing? could we be timing? could you be timing? could they be timing?
Perfect	V-ing perfect
could I have timed? could you have timed? could she have timed? could we have timed? could you have timed? could they have timed?	could I have been timing? could you have been timing? could she have been timing? could we have been timing? could you have been timing? could they have been timing?

Interro-negative form

Simple form	V-ing form
could I not time? could you not time? could she not time? could we not time? could you not time? could they not time?	could I not be timing? could you not be timing? could she not be timing? could we not be timing? could you not be timing? could they not be timing?
Perfect	V-ing perfect
could I not have timed? could you not have timed? could she not have timed? could we not have timed? could you not have timed? could they not have timed?	could I not have been timing? could you not have been timing? could she not have been timing? could we not have been timing? could you not have been timing? could they not have been timing?