I ought to stumble you ought to stumble he ought to stumble we ought to stumble you ought to stumble they ought to stumble
V-ing form
I ought to be stumbling you ought to be stumbling he ought to be stumbling we ought to be stumbling you ought to be stumbling they ought to be stumbling
Perfect
I ought to have stumbled you ought to have stumbled he ought to have stumbled we ought to have stumbled you ought to have stumbled they ought to have stumbled
V-ing perfect
I ought to have been stumbling you ought to have been stumbling he ought to have been stumbling we ought to have been stumbling you ought to have been stumbling they ought to have been stumbling
Negation
Simple form
I oughtn't to stumble you oughtn't to stumble he oughtn't to stumble we oughtn't to stumble you oughtn't to stumble they oughtn't to stumble
V-ing form
I oughtn't to be stumbling you oughtn't to be stumbling he oughtn't to be stumbling we oughtn't to be stumbling you oughtn't to be stumbling they oughtn't to be stumbling
Perfect
I oughtn't to have stumbled you oughtn't to have stumbled he oughtn't to have stumbled we oughtn't to have stumbled you oughtn't to have stumbled they oughtn't to have stumbled
V-ing perfect
I oughtn't to have been stumbling you oughtn't to have been stumbling he oughtn't to have been stumbling we oughtn't to have been stumbling you oughtn't to have been stumbling they oughtn't to have been stumbling
Interrogative form
Simple form
ought to I stumble? ought to you stumble? ought to he stumble? ought to we stumble? ought to you stumble? ought to they stumble?
V-ing form
ought to I be stumbling? ought to you be stumbling? ought to he be stumbling? ought to we be stumbling? ought to you be stumbling? ought to they be stumbling?
Perfect
ought to I have stumbled? ought to you have stumbled? ought to he have stumbled? ought to we have stumbled? ought to you have stumbled? ought to they have stumbled?
V-ing perfect
ought to I have been stumbling? ought to you have been stumbling? ought to he have been stumbling? ought to we have been stumbling? ought to you have been stumbling? ought to they have been stumbling?
Interro-negative form
Simple form
oughtn't I to stumble? oughtn't you to stumble? oughtn't he to stumble? oughtn't we to stumble? oughtn't you to stumble? oughtn't they to stumble?
V-ing form
oughtn't I to be stumbling? oughtn't you to be stumbling? oughtn't he to be stumbling? oughtn't we to be stumbling? oughtn't you to be stumbling? oughtn't they to be stumbling?
Perfect
oughtn't I to have stumbled? oughtn't you to have stumbled? oughtn't he to have stumbled? oughtn't we to have stumbled? oughtn't you to have stumbled? oughtn't they to have stumbled?
V-ing perfect
oughtn't I to have been stumbling? oughtn't you to have been stumbling? oughtn't he to have been stumbling? oughtn't we to have been stumbling? oughtn't you to have been stumbling? oughtn't they to have been stumbling?