English verb conjugation
COULD OVULATE

Regular verb: ovulate - ovulated - ovulated

Affirmation

Simple form	V-ing form
I could ovulate you could ovulate he could ovulate we could ovulate you could ovulate they could ovulate	I could be ovulating you could be ovulating he could be ovulating we could be ovulating you could be ovulating they could be ovulating
Perfect	V-ing perfect
I could have ovulated you could have ovulated he could have ovulated we could have ovulated you could have ovulated they could have ovulated	I could have been ovulating you could have been ovulating he could have been ovulating we could have been ovulating you could have been ovulating they could have been ovulating

Negation

Simple form	V-ing form
I could not ovulate you could not ovulate he could not ovulate we could not ovulate you could not ovulate they could not ovulate	I could not be ovulating you could not be ovulating he could not be ovulating we could not be ovulating you could not be ovulating they could not be ovulating
Perfect	V-ing perfect
I could not have ovulated you could not have ovulated he could not have ovulated we could not have ovulated you could not have ovulated they could not have ovulated	I could not have been ovulating you could not have been ovulating he could not have been ovulating we could not have been ovulating you could not have been ovulating they could not have been ovulating

Interrogative form

Simple form	V-ing form
could I ovulate? could you ovulate? could he ovulate? could we ovulate? could you ovulate? could they ovulate?	could I be ovulating? could you be ovulating? could he be ovulating? could we be ovulating? could you be ovulating? could they be ovulating?
Perfect	V-ing perfect
could I have ovulated? could you have ovulated? could he have ovulated? could we have ovulated? could you have ovulated? could they have ovulated?	could I have been ovulating? could you have been ovulating? could he have been ovulating? could we have been ovulating? could you have been ovulating? could they have been ovulating?

Interro-negative form

Simple form	V-ing form
could I not ovulate? could you not ovulate? could he not ovulate? could we not ovulate? could you not ovulate? could they not ovulate?	could I not be ovulating? could you not be ovulating? could he not be ovulating? could we not be ovulating? could you not be ovulating? could they not be ovulating?
Perfect	V-ing perfect
could I not have ovulated? could you not have ovulated? could he not have ovulated? could we not have ovulated? could you not have ovulated? could they not have ovulated?	could I not have been ovulating? could you not have been ovulating? could he not have been ovulating? could we not have been ovulating? could you not have been ovulating? could they not have been ovulating?