must fast
Verbo regular: fast - fasted- fasted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must fast
you must fast
he must fast
we must fast
you must fast
they must fast 	I must be fasting
you must be fasting
he must be fasting
we must be fasting
you must be fasting
they must be fasting	I must have fasted
you must have fasted
he must have fasted
we must have fasted
you must have fasted
they must have fasted	I must have been fasting
you must have been fasting
he must have been fasting
we must have been fasting
you must have been fasting
they must have been fasting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't fast
you mustn't fast
he mustn't fast
we mustn't fast
you mustn't fast
they mustn't fast 	I mustn't be fasting
you mustn't be fasting
he mustn't be fasting
we mustn't be fasting
you mustn't be fasting
they mustn't be fasting	I mustn't have fasted
you mustn't have fasted
he mustn't have fasted
we mustn't have fasted
you mustn't have fasted
they mustn't have fasted	I mustn't have been fasting
you mustn't have been fasting
he mustn't have been fasting
we mustn't have been fasting
you mustn't have been fasting
they mustn't have been fasting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I fast?
must you fast?
must he fast?
must we fast?
must you fast?
must they fast? 	must I be fasting?
must you be fasting?
must he be fasting?
must we be fasting?
must you be fasting?
must they be fasting? 	must I have fasted?
must you have fasted?
must he have fasted?
must we have fasted?
must you have fasted?
must they have fasted? 	must I have been fasting?
must you have been fasting?
must he have been fasting?
must we have been fasting?
must you have been fasting?
must they have been fasting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I fast?
mustn't you fast?
mustn't he fast?
mustn't we fast?
mustn't you fast?
mustn't they fast? 	mustn't I be fasting?
mustn't you be fasting?
mustn't he be fasting?
mustn't we be fasting?
mustn't you be fasting?
mustn't they be fasting? 	mustn't I have fasted?
mustn't you have fasted?
mustn't he have fasted?
mustn't we have fasted?
mustn't you have fasted?
mustn't they have fasted? 	mustn't I have been fasting?
mustn't you have been fasting?
mustn't he have been fasting?
mustn't we have been fasting?
mustn't you have been fasting?
mustn't they have been fasting?