could yammer yammer
Regular verb: yammer yammer - yammer yammered- yammer yammered

, this verb may not exist. Conjugation is given as example.

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could yammer yammer
you could yammer yammer
she could yammer yammer
we could yammer yammer
you could yammer yammer
they could yammer yammer 	I could be yammer yammering
you could be yammer yammering
she could be yammer yammering
we could be yammer yammering
you could be yammer yammering
they could be yammer yammering	I could have yammer yammered
you could have yammer yammered
she could have yammer yammered
we could have yammer yammered
you could have yammer yammered
they could have yammer yammered	I could have been yammer yammering
you could have been yammer yammering
she could have been yammer yammering
we could have been yammer yammering
you could have been yammer yammering
they could have been yammer yammering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't yammer yammer
you couldn't yammer yammer
she couldn't yammer yammer
we couldn't yammer yammer
you couldn't yammer yammer
they couldn't yammer yammer 	I couldn't be yammer yammering
you couldn't be yammer yammering
she couldn't be yammer yammering
we couldn't be yammer yammering
you couldn't be yammer yammering
they couldn't be yammer yammering	I couldn't have yammer yammered
you couldn't have yammer yammered
she couldn't have yammer yammered
we couldn't have yammer yammered
you couldn't have yammer yammered
they couldn't have yammer yammered	I couldn't have been yammer yammering
you couldn't have been yammer yammering
she couldn't have been yammer yammering
we couldn't have been yammer yammering
you couldn't have been yammer yammering
they couldn't have been yammer yammering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I yammer yammer?
could you yammer yammer?
could she yammer yammer?
could we yammer yammer?
could you yammer yammer?
could they yammer yammer? 	could I be yammer yammering?
could you be yammer yammering?
could she be yammer yammering?
could we be yammer yammering?
could you be yammer yammering?
could they be yammer yammering? 	could I have yammer yammered?
could you have yammer yammered?
could she have yammer yammered?
could we have yammer yammered?
could you have yammer yammered?
could they have yammer yammered? 	could I have been yammer yammering?
could you have been yammer yammering?
could she have been yammer yammering?
could we have been yammer yammering?
could you have been yammer yammering?
could they have been yammer yammering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I yammer yammer?
couldn't you yammer yammer?
couldn't she yammer yammer?
couldn't we yammer yammer?
couldn't you yammer yammer?
couldn't they yammer yammer? 	couldn't I be yammer yammering?
couldn't you be yammer yammering?
couldn't she be yammer yammering?
couldn't we be yammer yammering?
couldn't you be yammer yammering?
couldn't they be yammer yammering? 	couldn't I have yammer yammered?
couldn't you have yammer yammered?
couldn't she have yammer yammered?
couldn't we have yammer yammered?
couldn't you have yammer yammered?
couldn't they have yammer yammered? 	couldn't I have been yammer yammering?
couldn't you have been yammer yammering?
couldn't she have been yammer yammering?
couldn't we have been yammer yammering?
couldn't you have been yammer yammering?
couldn't they have been yammer yammering?