must ring
Verbo irregular: ring - rang- rung

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must ring
you must ring
he must ring
we must ring
you must ring
they must ring 	I must be ringing
you must be ringing
he must be ringing
we must be ringing
you must be ringing
they must be ringing	I must have rung
you must have rung
he must have rung
we must have rung
you must have rung
they must have rung	I must have been ringing
you must have been ringing
he must have been ringing
we must have been ringing
you must have been ringing
they must have been ringing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't ring
you mustn't ring
he mustn't ring
we mustn't ring
you mustn't ring
they mustn't ring 	I mustn't be ringing
you mustn't be ringing
he mustn't be ringing
we mustn't be ringing
you mustn't be ringing
they mustn't be ringing	I mustn't have rung
you mustn't have rung
he mustn't have rung
we mustn't have rung
you mustn't have rung
they mustn't have rung	I mustn't have been ringing
you mustn't have been ringing
he mustn't have been ringing
we mustn't have been ringing
you mustn't have been ringing
they mustn't have been ringing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I ring?
must you ring?
must he ring?
must we ring?
must you ring?
must they ring? 	must I be ringing?
must you be ringing?
must he be ringing?
must we be ringing?
must you be ringing?
must they be ringing? 	must I have rung?
must you have rung?
must he have rung?
must we have rung?
must you have rung?
must they have rung? 	must I have been ringing?
must you have been ringing?
must he have been ringing?
must we have been ringing?
must you have been ringing?
must they have been ringing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I ring?
mustn't you ring?
mustn't he ring?
mustn't we ring?
mustn't you ring?
mustn't they ring? 	mustn't I be ringing?
mustn't you be ringing?
mustn't he be ringing?
mustn't we be ringing?
mustn't you be ringing?
mustn't they be ringing? 	mustn't I have rung?
mustn't you have rung?
mustn't he have rung?
mustn't we have rung?
mustn't you have rung?
mustn't they have rung? 	mustn't I have been ringing?
mustn't you have been ringing?
mustn't he have been ringing?
mustn't we have been ringing?
mustn't you have been ringing?
mustn't they have been ringing?