could fever
Verbe régulier : fever - fevered- fevered

Affirmation 	
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I could fever
you could fever
he could fever
we could fever
you could fever
they could fever 	I could be fevering
you could be fevering
he could be fevering
we could be fevering
you could be fevering
they could be fevering	I could have fevered
you could have fevered
he 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
he could have been fevering
we could have been fevering
you could have been fevering
they could have been fevering	

Négation 	
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I couldn't fever
you couldn't fever
he couldn't fever
we couldn't fever
you couldn't fever
they couldn't fever 	I couldn't be fevering
you couldn't be fevering
he couldn't be fevering
we couldn't be fevering
you couldn't be fevering
they couldn't be fevering	I couldn't have fevered
you couldn't have fevered
he couldn't have fevered
we couldn't have fevered
you couldn't have fevered
they couldn't have fevered	I couldn't have been fevering
you couldn't have been fevering
he couldn't have been fevering
we couldn't have been fevering
you couldn't have been fevering
they couldn't have been fevering	

Forme interrogative 	
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could I fever?
could you fever?
could he fever?
could we fever?
could you fever?
could they fever? 	could I be fevering?
could you be fevering?
could he be fevering?
could we be fevering?
could you be fevering?
could they be fevering? 	could I have fevered?
could you have fevered?
could he 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 he have been fevering?
could we have been fevering?
could you have been fevering?
could they have been fevering? 	

Forme interro-négative 	
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couldn't I fever?
couldn't you fever?
couldn't he fever?
couldn't we fever?
couldn't you fever?
couldn't they fever? 	couldn't I be fevering?
couldn't you be fevering?
couldn't he be fevering?
couldn't we be fevering?
couldn't you be fevering?
couldn't they be fevering? 	couldn't I have fevered?
couldn't you have fevered?
couldn't he have fevered?
couldn't we have fevered?
couldn't you have fevered?
couldn't they have fevered? 	couldn't I have been fevering?
couldn't you have been fevering?
couldn't he have been fevering?
couldn't we have been fevering?
couldn't you have been fevering?
couldn't they have been fevering?