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
she could yak
we could yak
you could yak
they could yak 	I could be yaking
you could be yaking
she could be yaking
we could be yaking
you could be yaking
they could be yaking	I could have yaked
you could have yaked
she 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
she 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 couldn't yak
you couldn't yak
she couldn't yak
we couldn't yak
you couldn't yak
they couldn't yak 	I couldn't be yaking
you couldn't be yaking
she couldn't be yaking
we couldn't be yaking
you couldn't be yaking
they couldn't be yaking	I couldn't have yaked
you couldn't have yaked
she couldn't have yaked
we couldn't have yaked
you couldn't have yaked
they couldn't have yaked	I couldn't have been yaking
you couldn't have been yaking
she couldn't have been yaking
we couldn't have been yaking
you couldn't have been yaking
they couldn't have been yaking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I yak?
could you yak?
could she yak?
could we yak?
could you yak?
could they yak? 	could I be yaking?
could you be yaking?
could she be yaking?
could we be yaking?
could you be yaking?
could they be yaking? 	could I have yaked?
could you have yaked?
could she 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 she 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 	
couldn't I yak?
couldn't you yak?
couldn't she yak?
couldn't we yak?
couldn't you yak?
couldn't they yak? 	couldn't I be yaking?
couldn't you be yaking?
couldn't she be yaking?
couldn't we be yaking?
couldn't you be yaking?
couldn't they be yaking? 	couldn't I have yaked?
couldn't you have yaked?
couldn't she have yaked?
couldn't we have yaked?
couldn't you have yaked?
couldn't they have yaked? 	couldn't I have been yaking?
couldn't you have been yaking?
couldn't she have been yaking?
couldn't we have been yaking?
couldn't you have been yaking?
couldn't they have been yaking?