English verb conjugation
COULD CREST

Regular verb: crest - crested - crested

Affirmation

Simple form	V-ing form
I could crest you could crest he could crest we could crest you could crest they could crest	I could be cresting you could be cresting he could be cresting we could be cresting you could be cresting they could be cresting
Perfect	V-ing perfect
I could have crested you could have crested he could have crested we could have crested you could have crested they could have crested	I could have been cresting you could have been cresting he could have been cresting we could have been cresting you could have been cresting they could have been cresting

Negation

Simple form	V-ing form
I could not crest you could not crest he could not crest we could not crest you could not crest they could not crest	I could not be cresting you could not be cresting he could not be cresting we could not be cresting you could not be cresting they could not be cresting
Perfect	V-ing perfect
I could not have crested you could not have crested he could not have crested we could not have crested you could not have crested they could not have crested	I could not have been cresting you could not have been cresting he could not have been cresting we could not have been cresting you could not have been cresting they could not have been cresting

Interrogative form

Simple form	V-ing form
could I crest? could you crest? could he crest? could we crest? could you crest? could they crest?	could I be cresting? could you be cresting? could he be cresting? could we be cresting? could you be cresting? could they be cresting?
Perfect	V-ing perfect
could I have crested? could you have crested? could he have crested? could we have crested? could you have crested? could they have crested?	could I have been cresting? could you have been cresting? could he have been cresting? could we have been cresting? could you have been cresting? could they have been cresting?

Interro-negative form

Simple form	V-ing form
could I not crest? could you not crest? could he not crest? could we not crest? could you not crest? could they not crest?	could I not be cresting? could you not be cresting? could he not be cresting? could we not be cresting? could you not be cresting? could they not be cresting?
Perfect	V-ing perfect
could I not have crested? could you not have crested? could he not have crested? could we not have crested? could you not have crested? could they not have crested?	could I not have been cresting? could you not have been cresting? could he not have been cresting? could we not have been cresting? could you not have been cresting? could they not have been cresting?