must rack
Verbo regular: rack - racked- racked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must rack
you must rack
he must rack
we must rack
you must rack
they must rack 	I must be racking
you must be racking
he must be racking
we must be racking
you must be racking
they must be racking	I must have racked
you must have racked
he must have racked
we must have racked
you must have racked
they must have racked	I must have been racking
you must have been racking
he must have been racking
we must have been racking
you must have been racking
they must have been racking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't rack
you mustn't rack
he mustn't rack
we mustn't rack
you mustn't rack
they mustn't rack 	I mustn't be racking
you mustn't be racking
he mustn't be racking
we mustn't be racking
you mustn't be racking
they mustn't be racking	I mustn't have racked
you mustn't have racked
he mustn't have racked
we mustn't have racked
you mustn't have racked
they mustn't have racked	I mustn't have been racking
you mustn't have been racking
he mustn't have been racking
we mustn't have been racking
you mustn't have been racking
they mustn't have been racking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I rack?
must you rack?
must he rack?
must we rack?
must you rack?
must they rack? 	must I be racking?
must you be racking?
must he be racking?
must we be racking?
must you be racking?
must they be racking? 	must I have racked?
must you have racked?
must he have racked?
must we have racked?
must you have racked?
must they have racked? 	must I have been racking?
must you have been racking?
must he have been racking?
must we have been racking?
must you have been racking?
must they have been racking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I rack?
mustn't you rack?
mustn't he rack?
mustn't we rack?
mustn't you rack?
mustn't they rack? 	mustn't I be racking?
mustn't you be racking?
mustn't he be racking?
mustn't we be racking?
mustn't you be racking?
mustn't they be racking? 	mustn't I have racked?
mustn't you have racked?
mustn't he have racked?
mustn't we have racked?
mustn't you have racked?
mustn't they have racked? 	mustn't I have been racking?
mustn't you have been racking?
mustn't he have been racking?
mustn't we have been racking?
mustn't you have been racking?
mustn't they have been racking?