could yak
Verbe régulier : yak - yaked- yaked
Traduction française : jacasser 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could yak
you could yak
he could yak
we could yak
you could yak
they could yak 	I could be yaking
you could be yaking
he could be yaking
we could be yaking
you could be yaking
they could be yaking	I could have yaked
you could have yaked
he could have yaked
we could have yaked
you could have yaked
they could have yaked	I could have been yaking
you could have been yaking
he could have been yaking
we could have been yaking
you could have been yaking
they could have been yaking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not yak
you could not yak
he could not yak
we could not yak
you could not yak
they could not yak 	I could not be yaking
you could not be yaking
he could not be yaking
we could not be yaking
you could not be yaking
they could not be yaking	I could not have yaked
you could not have yaked
he could not have yaked
we could not have yaked
you could not have yaked
they could not have yaked	I could not have been yaking
you could not have been yaking
he could not have been yaking
we could not have been yaking
you could not have been yaking
they could not have been yaking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I yak?
could you yak?
could he yak?
could we yak?
could you yak?
could they yak? 	could I be yaking?
could you be yaking?
could he be yaking?
could we be yaking?
could you be yaking?
could they be yaking? 	could I have yaked?
could you have yaked?
could he have yaked?
could we have yaked?
could you have yaked?
could they have yaked? 	could I have been yaking?
could you have been yaking?
could he have been yaking?
could we have been yaking?
could you have been yaking?
could they have been yaking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not yak?
could you not yak?
could he not yak?
could we not yak?
could you not yak?
could they not yak? 	could I not be yaking?
could you not be yaking?
could he not be yaking?
could we not be yaking?
could you not be yaking?
could they not be yaking? 	could I not have yaked?
could you not have yaked?
could he not have yaked?
could we not have yaked?
could you not have yaked?
could they not have yaked? 	could I not have been yaking?
could you not have been yaking?
could he not have been yaking?
could we not have been yaking?
could you not have been yaking?
could they not have been yaking?