El verbo 'ought to' es igual al 'should' y expresa una obligación débil. Significa debería, tendría que.
Estructura afirmativa: Sujeto + ought + to + "verbo principal en infinitivo".
Nota: a diferencia de los otros "modal verbs" "ought" sí lleva "to" antes del verbo principal en infinitivo
Ejemplo: We ought to tell him Deberíamos contárselo.
Estructura pregunta: Muy Formal: "Ought" + sujeto + to + verbo en infinitivo + ?
Informal: Do/Does+ sujeto + think + pronombre personal + ought + to + verbo en infinitivo + ?
Ejemplo: Ought he to write a letter? ¿Debería él escribir una carta?
Estructura negación: Igual que ocurre con las preguntas, no es habitual negar con "Ought” por considerarse muy formal.
Ejemplo: We ought not go there No deberíamos ir allí
1) Afirmative Examples
The flight attendant ought to tell to the passenger when the plane will take off
The tourist class ought to be like the first class
The pilot ought to alert to stewardess when an accident occurs
The package tour ought to be the next week
2) Negative Examples
The airfare ought not to increase
The travel agency ought not to be responsible for the loss of objects in the plane
passenger ought not to carry their backpacker
Pets ought not to be in the passenger cabin
3) Questions
¿Ought the passenger to carry pets to the cabin?
¿Ought the pilot to take off the plane now ?
¿Ought the copilot to be in the cabin so early?
¿Ought the soldier to take the control of the plane ?
4) Examples (modal + have)
We ought to have listened to the guard
They ought to have repaired the aeroplane
The stewardess ought to have read the book of instructions to the passengers
Flight Captain ought to have notified the problem with the wings of the aeroplane