English verb conjugation
OUGHT TO STUMBLE

Regular verb: stumble - stumbled - stumbled

Affirmation

Simple form	V-ing form
I ought to stumble you ought to stumble he ought to stumble we ought to stumble you ought to stumble they ought to stumble	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?