I ought to skim you ought to skim she ought to skim we ought to skim you ought to skim they ought to skim
V-ing form
I ought to be skimming you ought to be skimming she ought to be skimming we ought to be skimming you ought to be skimming they ought to be skimming
Perfect
I ought to have skimmed you ought to have skimmed she ought to have skimmed we ought to have skimmed you ought to have skimmed they ought to have skimmed
V-ing perfect
I ought to have been skimming you ought to have been skimming she ought to have been skimming we ought to have been skimming you ought to have been skimming they ought to have been skimming
Negation
Simple form
I ought not to skim you ought not to skim she ought not to skim we ought not to skim you ought not to skim they ought not to skim
V-ing form
I ought not to skimming you ought not to skimming she ought not to skimming we ought not to skimming you ought not to skimming they ought not to skimming
Perfect
I ought not to have skimmed you ought not to have skimmed she ought not to have skimmed we ought not to have skimmed you ought not to have skimmed they ought not to have skimmed
V-ing perfect
I ought not to have been skimming you ought not to have been skimming she ought not to have been skimming we ought not to have been skimming you ought not to have been skimming they ought not to have been skimming
Interrogative form
Simple form
ought to I skim? ought to you skim? ought to she skim? ought to we skim? ought to you skim? ought to they skim?
V-ing form
ought to I be skimming? ought to you be skimming? ought to she be skimming? ought to we be skimming? ought to you be skimming? ought to they be skimming?
Perfect
ought to I have skimmed? ought to you have skimmed? ought to she have skimmed? ought to we have skimmed? ought to you have skimmed? ought to they have skimmed?
V-ing perfect
ought to I have been skimming? ought to you have been skimming? ought to she have been skimming? ought to we have been skimming? ought to you have been skimming? ought to they have been skimming?
Interro-negative form
Simple form
ought I not to skim? ought you not to skim? ought she not to skim? ought we not to skim? ought you not to skim? ought they not to skim?
V-ing form
ought I not to be skimming? ought you not to be skimming? ought she not to be skimming? ought we not to be skimming? ought you not to be skimming? ought they not to be skimming?
Perfect
ought I not to have skimmed? ought you not to have skimmed? ought she not to have skimmed? ought we not to have skimmed? ought you not to have skimmed? ought they not to have skimmed?
V-ing perfect
ought I not to have been skimming? ought you not to have been skimming? ought she not to have been skimming? ought we not to have been skimming? ought you not to have been skimming? ought they not to have been skimming?