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 couldn't crest you couldn't crest he couldn't crest we couldn't crest you couldn't crest they couldn't crest	I couldn't be cresting you couldn't be cresting he couldn't be cresting we couldn't be cresting you couldn't be cresting they couldn't be cresting
Perfect	V-ing perfect
I couldn't have crested you couldn't have crested he couldn't have crested we couldn't have crested you couldn't have crested they couldn't have crested	I couldn't have been cresting you couldn't have been cresting he couldn't have been cresting we couldn't have been cresting you couldn't have been cresting they couldn't 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
couldn't I crest? couldn't you crest? couldn't he crest? couldn't we crest? couldn't you crest? couldn't they crest?	couldn't I be cresting? couldn't you be cresting? couldn't he be cresting? couldn't we be cresting? couldn't you be cresting? couldn't they be cresting?
Perfect	V-ing perfect
couldn't I have crested? couldn't you have crested? couldn't he have crested? couldn't we have crested? couldn't you have crested? couldn't they have crested?	couldn't I have been cresting? couldn't you have been cresting? couldn't he have been cresting? couldn't we have been cresting? couldn't you have been cresting? couldn't they have been cresting?