must luff
Verbo regular: luff - luffed- luffed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must luff
you must luff
he must luff
we must luff
you must luff
they must luff 	I must be luffing
you must be luffing
he must be luffing
we must be luffing
you must be luffing
they must be luffing	I must have luffed
you must have luffed
he must have luffed
we must have luffed
you must have luffed
they must have luffed	I must have been luffing
you must have been luffing
he must have been luffing
we must have been luffing
you must have been luffing
they must have been luffing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't luff
you mustn't luff
he mustn't luff
we mustn't luff
you mustn't luff
they mustn't luff 	I mustn't be luffing
you mustn't be luffing
he mustn't be luffing
we mustn't be luffing
you mustn't be luffing
they mustn't be luffing	I mustn't have luffed
you mustn't have luffed
he mustn't have luffed
we mustn't have luffed
you mustn't have luffed
they mustn't have luffed	I mustn't have been luffing
you mustn't have been luffing
he mustn't have been luffing
we mustn't have been luffing
you mustn't have been luffing
they mustn't have been luffing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I luff?
must you luff?
must he luff?
must we luff?
must you luff?
must they luff? 	must I be luffing?
must you be luffing?
must he be luffing?
must we be luffing?
must you be luffing?
must they be luffing? 	must I have luffed?
must you have luffed?
must he have luffed?
must we have luffed?
must you have luffed?
must they have luffed? 	must I have been luffing?
must you have been luffing?
must he have been luffing?
must we have been luffing?
must you have been luffing?
must they have been luffing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I luff?
mustn't you luff?
mustn't he luff?
mustn't we luff?
mustn't you luff?
mustn't they luff? 	mustn't I be luffing?
mustn't you be luffing?
mustn't he be luffing?
mustn't we be luffing?
mustn't you be luffing?
mustn't they be luffing? 	mustn't I have luffed?
mustn't you have luffed?
mustn't he have luffed?
mustn't we have luffed?
mustn't you have luffed?
mustn't they have luffed? 	mustn't I have been luffing?
mustn't you have been luffing?
mustn't he have been luffing?
mustn't we have been luffing?
mustn't you have been luffing?
mustn't they have been luffing?