could estivate
Verbe régulier : estivate - estivated- estivated

Affirmation 	
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I could estivate
you could estivate
he could estivate
we could estivate
you could estivate
they could estivate 	I could be estivating
you could be estivating
he could be estivating
we could be estivating
you could be estivating
they could be estivating	I could have estivated
you could have estivated
he could have estivated
we could have estivated
you could have estivated
they could have estivated	I could have been estivating
you could have been estivating
he could have been estivating
we could have been estivating
you could have been estivating
they could have been estivating	

Négation 	
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I couldn't estivate
you couldn't estivate
he couldn't estivate
we couldn't estivate
you couldn't estivate
they couldn't estivate 	I couldn't be estivating
you couldn't be estivating
he couldn't be estivating
we couldn't be estivating
you couldn't be estivating
they couldn't be estivating	I couldn't have estivated
you couldn't have estivated
he couldn't have estivated
we couldn't have estivated
you couldn't have estivated
they couldn't have estivated	I couldn't have been estivating
you couldn't have been estivating
he couldn't have been estivating
we couldn't have been estivating
you couldn't have been estivating
they couldn't have been estivating	

Forme interrogative 	
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could I estivate?
could you estivate?
could he estivate?
could we estivate?
could you estivate?
could they estivate? 	could I be estivating?
could you be estivating?
could he be estivating?
could we be estivating?
could you be estivating?
could they be estivating? 	could I have estivated?
could you have estivated?
could he have estivated?
could we have estivated?
could you have estivated?
could they have estivated? 	could I have been estivating?
could you have been estivating?
could he have been estivating?
could we have been estivating?
could you have been estivating?
could they have been estivating? 	

Forme interro-négative 	
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couldn't I estivate?
couldn't you estivate?
couldn't he estivate?
couldn't we estivate?
couldn't you estivate?
couldn't they estivate? 	couldn't I be estivating?
couldn't you be estivating?
couldn't he be estivating?
couldn't we be estivating?
couldn't you be estivating?
couldn't they be estivating? 	couldn't I have estivated?
couldn't you have estivated?
couldn't he have estivated?
couldn't we have estivated?
couldn't you have estivated?
couldn't they have estivated? 	couldn't I have been estivating?
couldn't you have been estivating?
couldn't he have been estivating?
couldn't we have been estivating?
couldn't you have been estivating?
couldn't they have been estivating?