English verb conjugation
COULD CORKSCREW

Regular verb: corkscrew - corkscrewed - corkscrewed

Affirmation

Simple form	V-ing form
I could corkscrew you could corkscrew he could corkscrew we could corkscrew you could corkscrew they could corkscrew	I could be corkscrewing you could be corkscrewing he could be corkscrewing we could be corkscrewing you could be corkscrewing they could be corkscrewing
Perfect	V-ing perfect
I could have corkscrewed you could have corkscrewed he could have corkscrewed we could have corkscrewed you could have corkscrewed they could have corkscrewed	I could have been corkscrewing you could have been corkscrewing he could have been corkscrewing we could have been corkscrewing you could have been corkscrewing they could have been corkscrewing

Negation

Simple form	V-ing form
I couldn't corkscrew you couldn't corkscrew he couldn't corkscrew we couldn't corkscrew you couldn't corkscrew they couldn't corkscrew	I couldn't be corkscrewing you couldn't be corkscrewing he couldn't be corkscrewing we couldn't be corkscrewing you couldn't be corkscrewing they couldn't be corkscrewing
Perfect	V-ing perfect
I couldn't have corkscrewed you couldn't have corkscrewed he couldn't have corkscrewed we couldn't have corkscrewed you couldn't have corkscrewed they couldn't have corkscrewed	I couldn't have been corkscrewing you couldn't have been corkscrewing he couldn't have been corkscrewing we couldn't have been corkscrewing you couldn't have been corkscrewing they couldn't have been corkscrewing

Interrogative form

Simple form	V-ing form
could I corkscrew? could you corkscrew? could he corkscrew? could we corkscrew? could you corkscrew? could they corkscrew?	could I be corkscrewing? could you be corkscrewing? could he be corkscrewing? could we be corkscrewing? could you be corkscrewing? could they be corkscrewing?
Perfect	V-ing perfect
could I have corkscrewed? could you have corkscrewed? could he have corkscrewed? could we have corkscrewed? could you have corkscrewed? could they have corkscrewed?	could I have been corkscrewing? could you have been corkscrewing? could he have been corkscrewing? could we have been corkscrewing? could you have been corkscrewing? could they have been corkscrewing?

Interro-negative form

Simple form	V-ing form
couldn't I corkscrew? couldn't you corkscrew? couldn't he corkscrew? couldn't we corkscrew? couldn't you corkscrew? couldn't they corkscrew?	couldn't I be corkscrewing? couldn't you be corkscrewing? couldn't he be corkscrewing? couldn't we be corkscrewing? couldn't you be corkscrewing? couldn't they be corkscrewing?
Perfect	V-ing perfect
couldn't I have corkscrewed? couldn't you have corkscrewed? couldn't he have corkscrewed? couldn't we have corkscrewed? couldn't you have corkscrewed? couldn't they have corkscrewed?	couldn't I have been corkscrewing? couldn't you have been corkscrewing? couldn't he have been corkscrewing? couldn't we have been corkscrewing? couldn't you have been corkscrewing? couldn't they have been corkscrewing?