could quaver
Regular verb: quaver - quavered- quavered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could quaver
you could quaver
she could quaver
we could quaver
you could quaver
they could quaver 	I could be quavering
you could be quavering
she could be quavering
we could be quavering
you could be quavering
they could be quavering	I could have quavered
you could have quavered
she could have quavered
we could have quavered
you could have quavered
they could have quavered	I could have been quavering
you could have been quavering
she could have been quavering
we could have been quavering
you could have been quavering
they could have been quavering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't quaver
you couldn't quaver
she couldn't quaver
we couldn't quaver
you couldn't quaver
they couldn't quaver 	I couldn't be quavering
you couldn't be quavering
she couldn't be quavering
we couldn't be quavering
you couldn't be quavering
they couldn't be quavering	I couldn't have quavered
you couldn't have quavered
she couldn't have quavered
we couldn't have quavered
you couldn't have quavered
they couldn't have quavered	I couldn't have been quavering
you couldn't have been quavering
she couldn't have been quavering
we couldn't have been quavering
you couldn't have been quavering
they couldn't have been quavering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I quaver?
could you quaver?
could she quaver?
could we quaver?
could you quaver?
could they quaver? 	could I be quavering?
could you be quavering?
could she be quavering?
could we be quavering?
could you be quavering?
could they be quavering? 	could I have quavered?
could you have quavered?
could she have quavered?
could we have quavered?
could you have quavered?
could they have quavered? 	could I have been quavering?
could you have been quavering?
could she have been quavering?
could we have been quavering?
could you have been quavering?
could they have been quavering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I quaver?
couldn't you quaver?
couldn't she quaver?
couldn't we quaver?
couldn't you quaver?
couldn't they quaver? 	couldn't I be quavering?
couldn't you be quavering?
couldn't she be quavering?
couldn't we be quavering?
couldn't you be quavering?
couldn't they be quavering? 	couldn't I have quavered?
couldn't you have quavered?
couldn't she have quavered?
couldn't we have quavered?
couldn't you have quavered?
couldn't they have quavered? 	couldn't I have been quavering?
couldn't you have been quavering?
couldn't she have been quavering?
couldn't we have been quavering?
couldn't you have been quavering?
couldn't they have been quavering?