could haven
Verbe régulier : haven - havened- havened

Affirmation 	
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I could haven
you could haven
he could haven
we could haven
you could haven
they could haven 	I could be havening
you could be havening
he could be havening
we could be havening
you could be havening
they could be havening	I could have havened
you could have havened
he could have havened
we could have havened
you could have havened
they could have havened	I could have been havening
you could have been havening
he could have been havening
we could have been havening
you could have been havening
they could have been havening	

Négation 	
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I couldn't haven
you couldn't haven
he couldn't haven
we couldn't haven
you couldn't haven
they couldn't haven 	I couldn't be havening
you couldn't be havening
he couldn't be havening
we couldn't be havening
you couldn't be havening
they couldn't be havening	I couldn't have havened
you couldn't have havened
he couldn't have havened
we couldn't have havened
you couldn't have havened
they couldn't have havened	I couldn't have been havening
you couldn't have been havening
he couldn't have been havening
we couldn't have been havening
you couldn't have been havening
they couldn't have been havening	

Forme interrogative 	
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could I haven?
could you haven?
could he haven?
could we haven?
could you haven?
could they haven? 	could I be havening?
could you be havening?
could he be havening?
could we be havening?
could you be havening?
could they be havening? 	could I have havened?
could you have havened?
could he have havened?
could we have havened?
could you have havened?
could they have havened? 	could I have been havening?
could you have been havening?
could he have been havening?
could we have been havening?
could you have been havening?
could they have been havening? 	

Forme interro-négative 	
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couldn't I haven?
couldn't you haven?
couldn't he haven?
couldn't we haven?
couldn't you haven?
couldn't they haven? 	couldn't I be havening?
couldn't you be havening?
couldn't he be havening?
couldn't we be havening?
couldn't you be havening?
couldn't they be havening? 	couldn't I have havened?
couldn't you have havened?
couldn't he have havened?
couldn't we have havened?
couldn't you have havened?
couldn't they have havened? 	couldn't I have been havening?
couldn't you have been havening?
couldn't he have been havening?
couldn't we have been havening?
couldn't you have been havening?
couldn't they have been havening?