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 couldn't time you couldn't time she couldn't time we couldn't time you couldn't time they couldn't time	I couldn't be timing you couldn't be timing she couldn't be timing we couldn't be timing you couldn't be timing they couldn't be timing
Perfect	V-ing perfect
I couldn't have timed you couldn't have timed she couldn't have timed we couldn't have timed you couldn't have timed they couldn't have timed	I couldn't have been timing you couldn't have been timing she couldn't have been timing we couldn't have been timing you couldn't have been timing they couldn't 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
couldn't I time? couldn't you time? couldn't she time? couldn't we time? couldn't you time? couldn't they time?	couldn't I be timing? couldn't you be timing? couldn't she be timing? couldn't we be timing? couldn't you be timing? couldn't they be timing?
Perfect	V-ing perfect
couldn't I have timed? couldn't you have timed? couldn't she have timed? couldn't we have timed? couldn't you have timed? couldn't they have timed?	couldn't I have been timing? couldn't you have been timing? couldn't she have been timing? couldn't we have been timing? couldn't you have been timing? couldn't they have been timing?