ought to flunk
Regular verb: flunk - flunked- flunked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to flunk
you ought to flunk
she ought to flunk
we ought to flunk
you ought to flunk
they ought to flunk 	I ought to be flunking
you ought to be flunking
she ought to be flunking
we ought to be flunking
you ought to be flunking
they ought to be flunking	I ought to have flunked
you ought to have flunked
she ought to have flunked
we ought to have flunked
you ought to have flunked
they ought to have flunked	I ought to have been flunking
you ought to have been flunking
she ought to have been flunking
we ought to have been flunking
you ought to have been flunking
they ought to have been flunking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to flunk
you ought not to flunk
she ought not to flunk
we ought not to flunk
you ought not to flunk
they ought not to flunk 	I ought not to flunking
you ought not to flunking
she ought not to flunking
we ought not to flunking
you ought not to flunking
they ought not to flunking	I ought not to have flunked
you ought not to have flunked
she ought not to have flunked
we ought not to have flunked
you ought not to have flunked
they ought not to have flunked	I ought not to have been flunking
you ought not to have been flunking
she ought not to have been flunking
we ought not to have been flunking
you ought not to have been flunking
they ought not to have been flunking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I flunk?
ought to you flunk?
ought to she flunk?
ought to we flunk?
ought to you flunk?
ought to they flunk? 	ought to I be flunking?
ought to you be flunking?
ought to she be flunking?
ought to we be flunking?
ought to you be flunking?
ought to they be flunking? 	ought to I have flunked?
ought to you have flunked?
ought to she have flunked?
ought to we have flunked?
ought to you have flunked?
ought to they have flunked? 	ought to I have been flunking?
ought to you have been flunking?
ought to she have been flunking?
ought to we have been flunking?
ought to you have been flunking?
ought to they have been flunking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to flunk?
ought you not to flunk?
ought she not to flunk?
ought we not to flunk?
ought you not to flunk?
ought they not to flunk? 	ought I not to be flunking?
ought you not to be flunking?
ought she not to be flunking?
ought we not to be flunking?
ought you not to be flunking?
ought they not to be flunking? 	ought I not to have flunked?
ought you not to have flunked?
ought she not to have flunked?
ought we not to have flunked?
ought you not to have flunked?
ought they not to have flunked? 	ought I not to have been flunking?
ought you not to have been flunking?
ought she not to have been flunking?
ought we not to have been flunking?
ought you not to have been flunking?
ought they not to have been flunking?