must smooth
Verbo regular: smooth - smoothed- smoothed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must smooth
you must smooth
he must smooth
we must smooth
you must smooth
they must smooth 	I must be smoothing
you must be smoothing
he must be smoothing
we must be smoothing
you must be smoothing
they must be smoothing	I must have smoothed
you must have smoothed
he must have smoothed
we must have smoothed
you must have smoothed
they must have smoothed	I must have been smoothing
you must have been smoothing
he must have been smoothing
we must have been smoothing
you must have been smoothing
they must have been smoothing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't smooth
you mustn't smooth
he mustn't smooth
we mustn't smooth
you mustn't smooth
they mustn't smooth 	I mustn't be smoothing
you mustn't be smoothing
he mustn't be smoothing
we mustn't be smoothing
you mustn't be smoothing
they mustn't be smoothing	I mustn't have smoothed
you mustn't have smoothed
he mustn't have smoothed
we mustn't have smoothed
you mustn't have smoothed
they mustn't have smoothed	I mustn't have been smoothing
you mustn't have been smoothing
he mustn't have been smoothing
we mustn't have been smoothing
you mustn't have been smoothing
they mustn't have been smoothing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I smooth?
must you smooth?
must he smooth?
must we smooth?
must you smooth?
must they smooth? 	must I be smoothing?
must you be smoothing?
must he be smoothing?
must we be smoothing?
must you be smoothing?
must they be smoothing? 	must I have smoothed?
must you have smoothed?
must he have smoothed?
must we have smoothed?
must you have smoothed?
must they have smoothed? 	must I have been smoothing?
must you have been smoothing?
must he have been smoothing?
must we have been smoothing?
must you have been smoothing?
must they have been smoothing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I smooth?
mustn't you smooth?
mustn't he smooth?
mustn't we smooth?
mustn't you smooth?
mustn't they smooth? 	mustn't I be smoothing?
mustn't you be smoothing?
mustn't he be smoothing?
mustn't we be smoothing?
mustn't you be smoothing?
mustn't they be smoothing? 	mustn't I have smoothed?
mustn't you have smoothed?
mustn't he have smoothed?
mustn't we have smoothed?
mustn't you have smoothed?
mustn't they have smoothed? 	mustn't I have been smoothing?
mustn't you have been smoothing?
mustn't he have been smoothing?
mustn't we have been smoothing?
mustn't you have been smoothing?
mustn't they have been smoothing?