could crest
Regular verb: crest - crested- crested

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?