Archivo de categoría: A Practical English Grammar

DOCTOR: You needn’t go on a diet; but you must eat sensibly and you mustn’t overeat.  ZOO NOTICE: Visitors must not feed the animals. RAILWAY NOTICE: Passengers must not walk on the line. You mustn’t drive fast. There is a speed limit here. You needn’t drive fast. We’ve plenty of time. You needn’t strike aSigue leyendo ««need not,» «must not» y «must» en el presente y el futuro»

EMPLOYER: You needn’t make two copies. One will do; Give them this cheque. They needn’t send me a receipt; You needn’t change (your clothes). Just come as you are. You mustn’t repeat this to anyone; NOTICE IN SHOP: Stuff must not smoke when serving customers; You mustn’t leave your car unlocked. This place is fullSigue leyendo «ausencia de obligación y obligación negativa: «need not» y «must not» en el presente y el futuro»

[A] MOTHER: You must wipe your feet when you come in; SMALL BOY: I have to wipe my feet every time I come in. [B] MOTHER: You must wear a dress tonight. You can’t go to the opera in those dreadful jeans; EMPLOYER: You must use a dictionary. I’m tired of correcting your spelling mistakes;Sigue leyendo «obligación: diferencia entre «must» y «have to» en oraciones afirmativas»

must must es un verbo modal. Se usa en el presente o el futuro. NEGATIVA:must not/mustn’t INTERROGATIVA: must I? etc. INTERROGATIVA NEGATIVA: must I not?/mustn’t I? etc. El tiempo pasado lo proporciona «had to.» must toma el infinitivo sin «to». Puede expresar obligación y consejo enfático: FATHER: You must get up earlier in the morning.Sigue leyendo «obligación: «must» y «have to»: formas»

You ought to have told him that the paint on that seat was wet; You should have turned his omelette; he likes it turned; They ought to have stopped at the traffic lights; She shouldn’t have opened the letter; it wasn’t addressed to her; The Emergency Exit doors shouldn’t have been blocked. [ought/should con elSigue leyendo «obligación: «ought»/»should» + infinitivo de perfecto»

He ought to be studying for his exam. He shouldn’t be spending all his time on the beach; We should be wearing seat belts, (But we are not wearing them); I shouldn’t be telling you this. It’s supposed to be a secret. [ought/should con el infinitivo continuo expresan la idea de que el sujeto noSigue leyendo «obligación: «ought»/»should» + infinitivo continuo»

You should send in accurate income tax returns; They shouldn’t allow parking here; the street is too narrow; This word is spelt wrongly. There should be another ‘s’. PIANIST TO PUPIL: You must practise at least an hour a day; PUPIL TO MUSICAL FRIEND: I have to practise an hour a day! MUSICAL FRIEND: YouSigue leyendo «obligación: «ought»/»should» comparados con «must» y «have to»»

should es un verbo modal. Como en el caso de ought, para el presente y el futuro, y para el pasado cuando aparece precedida de un verbo en pasado, se usa una misma forma. should puede reemplazar a ought to.  NEGATIVA: should not/shouldn’t INTERROGATIVA:should I? etc. INTERROGATIVA NEGATIVA: should I not?/shouldn’t I? etc. should vaSigue leyendo «obligación: «should»: formas»

ought es un verbo modal. Para el presente y el futuro, y para el pasado cuando aparece precedida de un verbo en pasado o seguida de un infinitivo de perfecto, se utiliza una misma forma: I ought to write him today/tomorrow. I knew I ought to write him. She said I ought to write. ISigue leyendo «obligación: «ought»: formas»

I could have lent you the money. Why didn’t you ask me? The money has disappeared! Who could have taken it? Tom could have (taken it); he was here alone yesterday. He was able to send a message, (He sent it); He could have sent a message. (He didn’t send it or we don’t knowSigue leyendo ««Capacidad»: «could» + infinitivo de perfecto»