English verb conjugation
OUGHT TO UNDULATE

Regular verb: undulate - undulated - undulated

Affirmation

Simple form	V-ing form
I ought to undulate you ought to undulate he ought to undulate we ought to undulate you ought to undulate they ought to undulate	I ought to be undulating you ought to be undulating he ought to be undulating we ought to be undulating you ought to be undulating they ought to be undulating
Perfect	V-ing perfect
I ought to have undulated you ought to have undulated he ought to have undulated we ought to have undulated you ought to have undulated they ought to have undulated	I ought to have been undulating you ought to have been undulating he ought to have been undulating we ought to have been undulating you ought to have been undulating they ought to have been undulating

Negation

Simple form	V-ing form
I oughtn't to undulate you oughtn't to undulate he oughtn't to undulate we oughtn't to undulate you oughtn't to undulate they oughtn't to undulate	I oughtn't to be undulating you oughtn't to be undulating he oughtn't to be undulating we oughtn't to be undulating you oughtn't to be undulating they oughtn't to be undulating
Perfect	V-ing perfect
I oughtn't to have undulated you oughtn't to have undulated he oughtn't to have undulated we oughtn't to have undulated you oughtn't to have undulated they oughtn't to have undulated	I oughtn't to have been undulating you oughtn't to have been undulating he oughtn't to have been undulating we oughtn't to have been undulating you oughtn't to have been undulating they oughtn't to have been undulating

Interrogative form

Simple form	V-ing form
ought to I undulate? ought to you undulate? ought to he undulate? ought to we undulate? ought to you undulate? ought to they undulate?	ought to I be undulating? ought to you be undulating? ought to he be undulating? ought to we be undulating? ought to you be undulating? ought to they be undulating?
Perfect	V-ing perfect
ought to I have undulated? ought to you have undulated? ought to he have undulated? ought to we have undulated? ought to you have undulated? ought to they have undulated?	ought to I have been undulating? ought to you have been undulating? ought to he have been undulating? ought to we have been undulating? ought to you have been undulating? ought to they have been undulating?

Interro-negative form

Simple form	V-ing form
oughtn't I to undulate? oughtn't you to undulate? oughtn't he to undulate? oughtn't we to undulate? oughtn't you to undulate? oughtn't they to undulate?	oughtn't I to be undulating? oughtn't you to be undulating? oughtn't he to be undulating? oughtn't we to be undulating? oughtn't you to be undulating? oughtn't they to be undulating?
Perfect	V-ing perfect
oughtn't I to have undulated? oughtn't you to have undulated? oughtn't he to have undulated? oughtn't we to have undulated? oughtn't you to have undulated? oughtn't they to have undulated?	oughtn't I to have been undulating? oughtn't you to have been undulating? oughtn't he to have been undulating? oughtn't we to have been undulating? oughtn't you to have been undulating? oughtn't they to have been undulating?