English verb conjugation
MUST FATHOM

Regular verb: fathom - fathomed - fathomed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?