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 couldn't fathom you couldn't fathom she couldn't fathom we couldn't fathom you couldn't fathom they couldn't fathom	I couldn't be fathoming you couldn't be fathoming she couldn't be fathoming we couldn't be fathoming you couldn't be fathoming they couldn't be fathoming
Perfect	V-ing perfect
I couldn't have fathomed you couldn't have fathomed she couldn't have fathomed we couldn't have fathomed you couldn't have fathomed they couldn't have fathomed	I couldn't have been fathoming you couldn't have been fathoming she couldn't have been fathoming we couldn't have been fathoming you couldn't have been fathoming they couldn't 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
couldn't I fathom? couldn't you fathom? couldn't she fathom? couldn't we fathom? couldn't you fathom? couldn't they fathom?	couldn't I be fathoming? couldn't you be fathoming? couldn't she be fathoming? couldn't we be fathoming? couldn't you be fathoming? couldn't they be fathoming?
Perfect	V-ing perfect
couldn't I have fathomed? couldn't you have fathomed? couldn't she have fathomed? couldn't we have fathomed? couldn't you have fathomed? couldn't they have fathomed?	couldn't I have been fathoming? couldn't you have been fathoming? couldn't she have been fathoming? couldn't we have been fathoming? couldn't you have been fathoming? couldn't they have been fathoming?