I ought to skim you ought to skim he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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?