must fathom
Verbo regular: fathom - fathomed- fathomed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must fathom
you must fathom
he must fathom
we must fathom
you must fathom
they must fathom 	I must be fathoming
you must be fathoming
he must be fathoming
we must be fathoming
you must be fathoming
they must be fathoming	I must have fathomed
you must have fathomed
he must have fathomed
we must have fathomed
you must have fathomed
they must have fathomed	I must have been fathoming
you must have been fathoming
he must have been fathoming
we must have been fathoming
you must have been fathoming
they must have been fathoming	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't fathom
you mustn't fathom
he mustn't fathom
we mustn't fathom
you mustn't fathom
they mustn't fathom 	I mustn't be fathoming
you mustn't be fathoming
he mustn't be fathoming
we mustn't be fathoming
you mustn't be fathoming
they mustn't be fathoming	I mustn't have fathomed
you mustn't have fathomed
he mustn't have fathomed
we mustn't have fathomed
you mustn't have fathomed
they mustn't have fathomed	I mustn't have been fathoming
you mustn't have been fathoming
he mustn't have been fathoming
we mustn't have been fathoming
you mustn't have been fathoming
they mustn't have been fathoming	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I fathom?
must you fathom?
must he fathom?
must we fathom?
must you fathom?
must they fathom? 	must I be fathoming?
must you be fathoming?
must he be fathoming?
must we be fathoming?
must you be fathoming?
must they be fathoming? 	must I have fathomed?
must you have fathomed?
must he have fathomed?
must we have fathomed?
must you have fathomed?
must they have fathomed? 	must I have been fathoming?
must you have been fathoming?
must he have been fathoming?
must we have been fathoming?
must you have been fathoming?
must they have been fathoming? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I fathom?
mustn't you fathom?
mustn't he fathom?
mustn't we fathom?
mustn't you fathom?
mustn't they fathom? 	mustn't I be fathoming?
mustn't you be fathoming?
mustn't he be fathoming?
mustn't we be fathoming?
mustn't you be fathoming?
mustn't they be fathoming? 	mustn't I have fathomed?
mustn't you have fathomed?
mustn't he have fathomed?
mustn't we have fathomed?
mustn't you have fathomed?
mustn't they have fathomed? 	mustn't I have been fathoming?
mustn't you have been fathoming?
mustn't he have been fathoming?
mustn't we have been fathoming?
mustn't you have been fathoming?
mustn't they have been fathoming?