ought to fathom
Regular verb: fathom - fathomed- fathomed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to fathom
you ought not to fathom
she ought not to fathom
we ought not to fathom
you ought not to fathom
they ought not to fathom 	I ought not to fathoming
you ought not to fathoming
she ought not to fathoming
we ought not to fathoming
you ought not to fathoming
they ought not to fathoming	I ought not to have fathomed
you ought not to have fathomed
she ought not to have fathomed
we ought not to have fathomed
you ought not to have fathomed
they ought not to have fathomed	I ought not to have been fathoming
you ought not to have been fathoming
she ought not to have been fathoming
we ought not to have been fathoming
you ought not to have been fathoming
they ought not to have been fathoming	

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

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