could yes
Verbe régulier : yes - yesed- yesed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could yes
you could yes
he could yes
we could yes
you could yes
they could yes 	I could be yesing
you could be yesing
he could be yesing
we could be yesing
you could be yesing
they could be yesing	I could have yesed
you could have yesed
he could have yesed
we could have yesed
you could have yesed
they could have yesed	I could have been yesing
you could have been yesing
he could have been yesing
we could have been yesing
you could have been yesing
they could have been yesing	

Négation 	
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I couldn't yes
you couldn't yes
he couldn't yes
we couldn't yes
you couldn't yes
they couldn't yes 	I couldn't be yesing
you couldn't be yesing
he couldn't be yesing
we couldn't be yesing
you couldn't be yesing
they couldn't be yesing	I couldn't have yesed
you couldn't have yesed
he couldn't have yesed
we couldn't have yesed
you couldn't have yesed
they couldn't have yesed	I couldn't have been yesing
you couldn't have been yesing
he couldn't have been yesing
we couldn't have been yesing
you couldn't have been yesing
they couldn't have been yesing	

Forme interrogative 	
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could I yes?
could you yes?
could he yes?
could we yes?
could you yes?
could they yes? 	could I be yesing?
could you be yesing?
could he be yesing?
could we be yesing?
could you be yesing?
could they be yesing? 	could I have yesed?
could you have yesed?
could he have yesed?
could we have yesed?
could you have yesed?
could they have yesed? 	could I have been yesing?
could you have been yesing?
could he have been yesing?
could we have been yesing?
could you have been yesing?
could they have been yesing? 	

Forme interro-négative 	
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couldn't I yes?
couldn't you yes?
couldn't he yes?
couldn't we yes?
couldn't you yes?
couldn't they yes? 	couldn't I be yesing?
couldn't you be yesing?
couldn't he be yesing?
couldn't we be yesing?
couldn't you be yesing?
couldn't they be yesing? 	couldn't I have yesed?
couldn't you have yesed?
couldn't he have yesed?
couldn't we have yesed?
couldn't you have yesed?
couldn't they have yesed? 	couldn't I have been yesing?
couldn't you have been yesing?
couldn't he have been yesing?
couldn't we have been yesing?
couldn't you have been yesing?
couldn't they have been yesing?