could grave
Verbe régulier : grave - graved- graved

Affirmation 	
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I could grave
you could grave
he could grave
we could grave
you could grave
they could grave 	I could be graving
you could be graving
he could be graving
we could be graving
you could be graving
they could be graving	I could have graved
you could have graved
he could have graved
we could have graved
you could have graved
they could have graved	I could have been graving
you could have been graving
he could have been graving
we could have been graving
you could have been graving
they could have been graving	

Négation 	
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I couldn't grave
you couldn't grave
he couldn't grave
we couldn't grave
you couldn't grave
they couldn't grave 	I couldn't be graving
you couldn't be graving
he couldn't be graving
we couldn't be graving
you couldn't be graving
they couldn't be graving	I couldn't have graved
you couldn't have graved
he couldn't have graved
we couldn't have graved
you couldn't have graved
they couldn't have graved	I couldn't have been graving
you couldn't have been graving
he couldn't have been graving
we couldn't have been graving
you couldn't have been graving
they couldn't have been graving	

Forme interrogative 	
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could I grave?
could you grave?
could he grave?
could we grave?
could you grave?
could they grave? 	could I be graving?
could you be graving?
could he be graving?
could we be graving?
could you be graving?
could they be graving? 	could I have graved?
could you have graved?
could he have graved?
could we have graved?
could you have graved?
could they have graved? 	could I have been graving?
could you have been graving?
could he have been graving?
could we have been graving?
could you have been graving?
could they have been graving? 	

Forme interro-négative 	
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couldn't I grave?
couldn't you grave?
couldn't he grave?
couldn't we grave?
couldn't you grave?
couldn't they grave? 	couldn't I be graving?
couldn't you be graving?
couldn't he be graving?
couldn't we be graving?
couldn't you be graving?
couldn't they be graving? 	couldn't I have graved?
couldn't you have graved?
couldn't he have graved?
couldn't we have graved?
couldn't you have graved?
couldn't they have graved? 	couldn't I have been graving?
couldn't you have been graving?
couldn't he have been graving?
couldn't we have been graving?
couldn't you have been graving?
couldn't they have been graving?