Presta atención a las preposiciones AT, IN, ON, para que recuerdas cuando se las debe utiliza y cuándo no.
PREPOSICIONES AT, IN, ON
PREPOSICIÓN | EXPRESIÓN |
AT | at six o'clock at midnight at Christmas at the weekend |
IN | in the morning/afternoon/evening in December in summer in 2013 in two weeks' time |
ON | on Sunday on Monday morning on Christmas Day on January 18 |
SIN PREPOSICIÓN | today yesterday tomorrow the day after tomorrow the day before yesterday last night last week two weeks ago next month yesterday evening tomorrow evening this evening tonight |