English verb conjugation
COULD CREST

Regular verb: crest - crested - crested

Affirmation

Simple form	V-ing form
I could crest you could crest she could crest we could crest you could crest they could crest	I could be cresting you could be cresting she 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 she 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 she 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 she 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 she 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 she 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 she 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 she crest? could we crest? could you crest? could they crest?	could I be cresting? could you be cresting? could she 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 she 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 she 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 she 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 she 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 she 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 she have been cresting? couldn't we have been cresting? couldn't you have been cresting? couldn't they have been cresting?