must slack
Verbo regular: slack - slacked- slacked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must slack
you must slack
he must slack
we must slack
you must slack
they must slack 	I must be slacking
you must be slacking
he must be slacking
we must be slacking
you must be slacking
they must be slacking	I must have slacked
you must have slacked
he must have slacked
we must have slacked
you must have slacked
they must have slacked	I must have been slacking
you must have been slacking
he must have been slacking
we must have been slacking
you must have been slacking
they must have been slacking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't slack
you mustn't slack
he mustn't slack
we mustn't slack
you mustn't slack
they mustn't slack 	I mustn't be slacking
you mustn't be slacking
he mustn't be slacking
we mustn't be slacking
you mustn't be slacking
they mustn't be slacking	I mustn't have slacked
you mustn't have slacked
he mustn't have slacked
we mustn't have slacked
you mustn't have slacked
they mustn't have slacked	I mustn't have been slacking
you mustn't have been slacking
he mustn't have been slacking
we mustn't have been slacking
you mustn't have been slacking
they mustn't have been slacking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I slack?
must you slack?
must he slack?
must we slack?
must you slack?
must they slack? 	must I be slacking?
must you be slacking?
must he be slacking?
must we be slacking?
must you be slacking?
must they be slacking? 	must I have slacked?
must you have slacked?
must he have slacked?
must we have slacked?
must you have slacked?
must they have slacked? 	must I have been slacking?
must you have been slacking?
must he have been slacking?
must we have been slacking?
must you have been slacking?
must they have been slacking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I slack?
mustn't you slack?
mustn't he slack?
mustn't we slack?
mustn't you slack?
mustn't they slack? 	mustn't I be slacking?
mustn't you be slacking?
mustn't he be slacking?
mustn't we be slacking?
mustn't you be slacking?
mustn't they be slacking? 	mustn't I have slacked?
mustn't you have slacked?
mustn't he have slacked?
mustn't we have slacked?
mustn't you have slacked?
mustn't they have slacked? 	mustn't I have been slacking?
mustn't you have been slacking?
mustn't he have been slacking?
mustn't we have been slacking?
mustn't you have been slacking?
mustn't they have been slacking?