should fathom
Regular verb: fathom - fathomed- fathomed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should fathom
you should fathom
he should fathom
we should fathom
you should fathom
they should fathom 	I should be fathoming
you should be fathoming
he should be fathoming
we should be fathoming
you should be fathoming
they should be fathoming	I should have fathomed
you should have fathomed
he should have fathomed
we should have fathomed
you should have fathomed
they should have fathomed	I should have been fathoming
you should have been fathoming
he should have been fathoming
we should have been fathoming
you should have been fathoming
they should have been fathoming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not fathom
you should not fathom
he should not fathom
we should not fathom
you should not fathom
they should not fathom 	I should not be fathoming
you should not be fathoming
he should not be fathoming
we should not be fathoming
you should not be fathoming
they should not be fathoming	I should not have fathomed
you should not have fathomed
he should not have fathomed
we should not have fathomed
you should not have fathomed
they should not have fathomed	I should not have been fathoming
you should not have been fathoming
he should not have been fathoming
we should not have been fathoming
you should not have been fathoming
they should not have been fathoming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I fathom?
should you fathom?
should he fathom?
should we fathom?
should you fathom?
should they fathom? 	should I be fathoming?
should you be fathoming?
should he be fathoming?
should we be fathoming?
should you be fathoming?
should they be fathoming? 	should I have fathomed?
should you have fathomed?
should he have fathomed?
should we have fathomed?
should you have fathomed?
should they have fathomed? 	should I have been fathoming?
should you have been fathoming?
should he have been fathoming?
should we have been fathoming?
should you have been fathoming?
should they have been fathoming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not fathom?
should you not fathom?
should he not fathom?
should we not fathom?
should you not fathom?
should they not fathom? 	should I not be fathoming?
should you not be fathoming?
should he not be fathoming?
should we not be fathoming?
should you not be fathoming?
should they not be fathoming? 	should I not have fathomed?
should you not have fathomed?
should he not have fathomed?
should we not have fathomed?
should you not have fathomed?
should they not have fathomed? 	should I not have been fathoming?
should you not have been fathoming?
should he not have been fathoming?
should we not have been fathoming?
should you not have been fathoming?
should they not have been fathoming?