must luff
Verbo regular: luff - luffed- luffed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not luff
you must not luff
he must not luff
we must not luff
you must not luff
they must not luff 	I must not be luffing
you must not be luffing
he must not be luffing
we must not be luffing
you must not be luffing
they must not be luffing	I must not have luffed
you must not have luffed
he must not have luffed
we must not have luffed
you must not have luffed
they must not have luffed	I must not have been luffing
you must not have been luffing
he must not have been luffing
we must not have been luffing
you must not have been luffing
they must not have been luffing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not luff?
must you not luff?
must he not luff?
must we not luff?
must you not luff?
must they not luff? 	must I not be luffing?
must you not be luffing?
must he not be luffing?
must we not be luffing?
must you not be luffing?
must they not be luffing? 	must I not have luffed?
must you not have luffed?
must he not have luffed?
must we not have luffed?
must you not have luffed?
must they not have luffed? 	must I not have been luffing?
must you not have been luffing?
must he not have been luffing?
must we not have been luffing?
must you not have been luffing?
must they not have been luffing?