must quaver
Verbo regular: quaver - quavered- quavered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not quaver
you must not quaver
he must not quaver
we must not quaver
you must not quaver
they must not quaver 	I must not be quavering
you must not be quavering
he must not be quavering
we must not be quavering
you must not be quavering
they must not be quavering	I must not have quavered
you must not have quavered
he must not have quavered
we must not have quavered
you must not have quavered
they must not have quavered	I must not have been quavering
you must not have been quavering
he must not have been quavering
we must not have been quavering
you must not have been quavering
they must not have been quavering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not quaver?
must you not quaver?
must he not quaver?
must we not quaver?
must you not quaver?
must they not quaver? 	must I not be quavering?
must you not be quavering?
must he not be quavering?
must we not be quavering?
must you not be quavering?
must they not be quavering? 	must I not have quavered?
must you not have quavered?
must he not have quavered?
must we not have quavered?
must you not have quavered?
must they not have quavered? 	must I not have been quavering?
must you not have been quavering?
must he not have been quavering?
must we not have been quavering?
must you not have been quavering?
must they not have been quavering?