could yammer
Verbe régulier : yammer - yammered- yammered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could yammer
you could yammer
she could yammer
we could yammer
you could yammer
they could yammer 	I could be yammering
you could be yammering
she could be yammering
we could be yammering
you could be yammering
they could be yammering	I could have yammered
you could have yammered
she could have yammered
we could have yammered
you could have yammered
they could have yammered	I could have been yammering
you could have been yammering
she could have been yammering
we could have been yammering
you could have been yammering
they could have been yammering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't yammer
you couldn't yammer
she couldn't yammer
we couldn't yammer
you couldn't yammer
they couldn't yammer 	I couldn't be yammering
you couldn't be yammering
she couldn't be yammering
we couldn't be yammering
you couldn't be yammering
they couldn't be yammering	I couldn't have yammered
you couldn't have yammered
she couldn't have yammered
we couldn't have yammered
you couldn't have yammered
they couldn't have yammered	I couldn't have been yammering
you couldn't have been yammering
she couldn't have been yammering
we couldn't have been yammering
you couldn't have been yammering
they couldn't have been yammering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I yammer?
could you yammer?
could she yammer?
could we yammer?
could you yammer?
could they yammer? 	could I be yammering?
could you be yammering?
could she be yammering?
could we be yammering?
could you be yammering?
could they be yammering? 	could I have yammered?
could you have yammered?
could she have yammered?
could we have yammered?
could you have yammered?
could they have yammered? 	could I have been yammering?
could you have been yammering?
could she have been yammering?
could we have been yammering?
could you have been yammering?
could they have been yammering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I yammer?
couldn't you yammer?
couldn't she yammer?
couldn't we yammer?
couldn't you yammer?
couldn't they yammer? 	couldn't I be yammering?
couldn't you be yammering?
couldn't she be yammering?
couldn't we be yammering?
couldn't you be yammering?
couldn't they be yammering? 	couldn't I have yammered?
couldn't you have yammered?
couldn't she have yammered?
couldn't we have yammered?
couldn't you have yammered?
couldn't they have yammered? 	couldn't I have been yammering?
couldn't you have been yammering?
couldn't she have been yammering?
couldn't we have been yammering?
couldn't you have been yammering?
couldn't they have been yammering?