Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could overfill overfill you could overfill overfill he could overfill overfill we could overfill overfill you could overfill overfill they could overfill overfill
V-ing form
I could be overfill overfilling you could be overfill overfilling he could be overfill overfilling we could be overfill overfilling you could be overfill overfilling they could be overfill overfilling
Perfect
I could have overfill overfilled you could have overfill overfilled he could have overfill overfilled we could have overfill overfilled you could have overfill overfilled they could have overfill overfilled
V-ing perfect
I could have been overfill overfilling you could have been overfill overfilling he could have been overfill overfilling we could have been overfill overfilling you could have been overfill overfilling they could have been overfill overfilling
Negation
Simple form
I could not overfill overfill you could not overfill overfill he could not overfill overfill we could not overfill overfill you could not overfill overfill they could not overfill overfill
V-ing form
I could not be overfill overfilling you could not be overfill overfilling he could not be overfill overfilling we could not be overfill overfilling you could not be overfill overfilling they could not be overfill overfilling
Perfect
I could not have overfill overfilled you could not have overfill overfilled he could not have overfill overfilled we could not have overfill overfilled you could not have overfill overfilled they could not have overfill overfilled
V-ing perfect
I could not have been overfill overfilling you could not have been overfill overfilling he could not have been overfill overfilling we could not have been overfill overfilling you could not have been overfill overfilling they could not have been overfill overfilling
Interrogative form
Simple form
could I overfill overfill? could you overfill overfill? could he overfill overfill? could we overfill overfill? could you overfill overfill? could they overfill overfill?
V-ing form
could I be overfill overfilling? could you be overfill overfilling? could he be overfill overfilling? could we be overfill overfilling? could you be overfill overfilling? could they be overfill overfilling?
Perfect
could I have overfill overfilled? could you have overfill overfilled? could he have overfill overfilled? could we have overfill overfilled? could you have overfill overfilled? could they have overfill overfilled?
V-ing perfect
could I have been overfill overfilling? could you have been overfill overfilling? could he have been overfill overfilling? could we have been overfill overfilling? could you have been overfill overfilling? could they have been overfill overfilling?
Interro-negative form
Simple form
could I not overfill overfill? could you not overfill overfill? could he not overfill overfill? could we not overfill overfill? could you not overfill overfill? could they not overfill overfill?
V-ing form
could I not be overfill overfilling? could you not be overfill overfilling? could he not be overfill overfilling? could we not be overfill overfilling? could you not be overfill overfilling? could they not be overfill overfilling?
Perfect
could I not have overfill overfilled? could you not have overfill overfilled? could he not have overfill overfilled? could we not have overfill overfilled? could you not have overfill overfilled? could they not have overfill overfilled?
V-ing perfect
could I not have been overfill overfilling? could you not have been overfill overfilling? could he not have been overfill overfilling? could we not have been overfill overfilling? could you not have been overfill overfilling? could they not have been overfill overfilling?