must ferment
Verbo regular: ferment - fermented- fermented

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must ferment
you must ferment
he must ferment
we must ferment
you must ferment
they must ferment 	I must be fermenting
you must be fermenting
he must be fermenting
we must be fermenting
you must be fermenting
they must be fermenting	I must have fermented
you must have fermented
he must have fermented
we must have fermented
you must have fermented
they must have fermented	I must have been fermenting
you must have been fermenting
he must have been fermenting
we must have been fermenting
you must have been fermenting
they must have been fermenting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't ferment
you mustn't ferment
he mustn't ferment
we mustn't ferment
you mustn't ferment
they mustn't ferment 	I mustn't be fermenting
you mustn't be fermenting
he mustn't be fermenting
we mustn't be fermenting
you mustn't be fermenting
they mustn't be fermenting	I mustn't have fermented
you mustn't have fermented
he mustn't have fermented
we mustn't have fermented
you mustn't have fermented
they mustn't have fermented	I mustn't have been fermenting
you mustn't have been fermenting
he mustn't have been fermenting
we mustn't have been fermenting
you mustn't have been fermenting
they mustn't have been fermenting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I ferment?
must you ferment?
must he ferment?
must we ferment?
must you ferment?
must they ferment? 	must I be fermenting?
must you be fermenting?
must he be fermenting?
must we be fermenting?
must you be fermenting?
must they be fermenting? 	must I have fermented?
must you have fermented?
must he have fermented?
must we have fermented?
must you have fermented?
must they have fermented? 	must I have been fermenting?
must you have been fermenting?
must he have been fermenting?
must we have been fermenting?
must you have been fermenting?
must they have been fermenting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I ferment?
mustn't you ferment?
mustn't he ferment?
mustn't we ferment?
mustn't you ferment?
mustn't they ferment? 	mustn't I be fermenting?
mustn't you be fermenting?
mustn't he be fermenting?
mustn't we be fermenting?
mustn't you be fermenting?
mustn't they be fermenting? 	mustn't I have fermented?
mustn't you have fermented?
mustn't he have fermented?
mustn't we have fermented?
mustn't you have fermented?
mustn't they have fermented? 	mustn't I have been fermenting?
mustn't you have been fermenting?
mustn't he have been fermenting?
mustn't we have been fermenting?
mustn't you have been fermenting?
mustn't they have been fermenting?