English verb conjugation
COULD FEVER

Regular verb: fever - fevered - fevered

Affirmation

Simple form	V-ing form
I could fever you could fever she could fever we could fever you could fever they could fever	I could be fevering you could be fevering she could be fevering we could be fevering you could be fevering they could be fevering
Perfect	V-ing perfect
I could have fevered you could have fevered she could have fevered we could have fevered you could have fevered they could have fevered	I could have been fevering you could have been fevering she could have been fevering we could have been fevering you could have been fevering they could have been fevering

Negation

Simple form	V-ing form
I could not fever you could not fever she could not fever we could not fever you could not fever they could not fever	I could not be fevering you could not be fevering she could not be fevering we could not be fevering you could not be fevering they could not be fevering
Perfect	V-ing perfect
I could not have fevered you could not have fevered she could not have fevered we could not have fevered you could not have fevered they could not have fevered	I could not have been fevering you could not have been fevering she could not have been fevering we could not have been fevering you could not have been fevering they could not have been fevering

Interrogative form

Simple form	V-ing form
could I fever? could you fever? could she fever? could we fever? could you fever? could they fever?	could I be fevering? could you be fevering? could she be fevering? could we be fevering? could you be fevering? could they be fevering?
Perfect	V-ing perfect
could I have fevered? could you have fevered? could she have fevered? could we have fevered? could you have fevered? could they have fevered?	could I have been fevering? could you have been fevering? could she have been fevering? could we have been fevering? could you have been fevering? could they have been fevering?

Interro-negative form

Simple form	V-ing form
could I not fever? could you not fever? could she not fever? could we not fever? could you not fever? could they not fever?	could I not be fevering? could you not be fevering? could she not be fevering? could we not be fevering? could you not be fevering? could they not be fevering?
Perfect	V-ing perfect
could I not have fevered? could you not have fevered? could she not have fevered? could we not have fevered? could you not have fevered? could they not have fevered?	could I not have been fevering? could you not have been fevering? could she not have been fevering? could we not have been fevering? could you not have been fevering? could they not have been fevering?