English verb conjugation
COULD FATHOM

Regular verb: fathom - fathomed - fathomed

Affirmation

Simple form	V-ing form
I could fathom you could fathom she could fathom we could fathom you could fathom they could fathom	I could be fathoming you could be fathoming she could be fathoming we could be fathoming you could be fathoming they could be fathoming
Perfect	V-ing perfect
I could have fathomed you could have fathomed she could have fathomed we could have fathomed you could have fathomed they could have fathomed	I could have been fathoming you could have been fathoming she could have been fathoming we could have been fathoming you could have been fathoming they could have been fathoming

Negation

Simple form	V-ing form
I could not fathom you could not fathom she could not fathom we could not fathom you could not fathom they could not fathom	I could not be fathoming you could not be fathoming she could not be fathoming we could not be fathoming you could not be fathoming they could not be fathoming
Perfect	V-ing perfect
I could not have fathomed you could not have fathomed she could not have fathomed we could not have fathomed you could not have fathomed they could not have fathomed	I could not have been fathoming you could not have been fathoming she could not have been fathoming we could not have been fathoming you could not have been fathoming they could not have been fathoming

Interrogative form

Simple form	V-ing form
could I fathom? could you fathom? could she fathom? could we fathom? could you fathom? could they fathom?	could I be fathoming? could you be fathoming? could she be fathoming? could we be fathoming? could you be fathoming? could they be fathoming?
Perfect	V-ing perfect
could I have fathomed? could you have fathomed? could she have fathomed? could we have fathomed? could you have fathomed? could they have fathomed?	could I have been fathoming? could you have been fathoming? could she have been fathoming? could we have been fathoming? could you have been fathoming? could they have been fathoming?

Interro-negative form

Simple form	V-ing form
could I not fathom? could you not fathom? could she not fathom? could we not fathom? could you not fathom? could they not fathom?	could I not be fathoming? could you not be fathoming? could she not be fathoming? could we not be fathoming? could you not be fathoming? could they not be fathoming?
Perfect	V-ing perfect
could I not have fathomed? could you not have fathomed? could she not have fathomed? could we not have fathomed? could you not have fathomed? could they not have fathomed?	could I not have been fathoming? could you not have been fathoming? could she not have been fathoming? could we not have been fathoming? could you not have been fathoming? could they not have been fathoming?