must quaver
Verbo regular: quaver - quavered- quavered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must quaver
you must quaver
he must quaver
we must quaver
you must quaver
they must quaver 	I must be quavering
you must be quavering
he must be quavering
we must be quavering
you must be quavering
they must be quavering	I must have quavered
you must have quavered
he must have quavered
we must have quavered
you must have quavered
they must have quavered	I must have been quavering
you must have been quavering
he must have been quavering
we must have been quavering
you must have been quavering
they must have been quavering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't quaver
you mustn't quaver
he mustn't quaver
we mustn't quaver
you mustn't quaver
they mustn't quaver 	I mustn't be quavering
you mustn't be quavering
he mustn't be quavering
we mustn't be quavering
you mustn't be quavering
they mustn't be quavering	I mustn't have quavered
you mustn't have quavered
he mustn't have quavered
we mustn't have quavered
you mustn't have quavered
they mustn't have quavered	I mustn't have been quavering
you mustn't have been quavering
he mustn't have been quavering
we mustn't have been quavering
you mustn't have been quavering
they mustn't have been quavering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I quaver?
must you quaver?
must he quaver?
must we quaver?
must you quaver?
must they quaver? 	must I be quavering?
must you be quavering?
must he be quavering?
must we be quavering?
must you be quavering?
must they be quavering? 	must I have quavered?
must you have quavered?
must he have quavered?
must we have quavered?
must you have quavered?
must they have quavered? 	must I have been quavering?
must you have been quavering?
must he have been quavering?
must we have been quavering?
must you have been quavering?
must they have been quavering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I quaver?
mustn't you quaver?
mustn't he quaver?
mustn't we quaver?
mustn't you quaver?
mustn't they quaver? 	mustn't I be quavering?
mustn't you be quavering?
mustn't he be quavering?
mustn't we be quavering?
mustn't you be quavering?
mustn't they be quavering? 	mustn't I have quavered?
mustn't you have quavered?
mustn't he have quavered?
mustn't we have quavered?
mustn't you have quavered?
mustn't they have quavered? 	mustn't I have been quavering?
mustn't you have been quavering?
mustn't he have been quavering?
mustn't we have been quavering?
mustn't you have been quavering?
mustn't they have been quavering?