Prepositions Time

Respuesta correcta: B) at / on

• A) on / atThat pair swaps the two functions: 'on' goes with days and 'at' belongs with clock times, so it reverses the correct order.
• B) at / onUse 'at' with a precise clock time and 'on' with a named day, so the exam starts at 9:00 on Thursday.
• C) in / on'In' introduces longer periods such as months and years, so it cannot mark the exact hour 9:00.
• D) at / in'At' fits the hour, but a named day such as Thursday needs 'on' rather than 'in'.

Respuesta correcta: B) since

• A) for'For' introduces a length of time, such as five years, and not the year in which an activity began.
• B) since'Since' links a past starting point with a situation that is still true in the present, which is exactly Ana's case.
• C) during'During 2021' places the membership inside that year without saying anything about the present.
• D) until'Until' marks an endpoint in time, the opposite role from the beginning the sentence describes.

Respuesta correcta: C) since

• A) until'Until 2019' would mark an endpoint, but the student is still living in the city now.
• B) during'During 2019' confines the action to that year and says nothing about the present.
• C) since'Since 2019' states the starting point of a situation that continues to the present, which fits an ongoing residence.
• D) for'For 2019' would need a duration, and a single year that opens an ongoing action is expressed with 'since'.

Respuesta correcta: C) in 2024

• A) on 2024'On' goes with days and dates, and not with a year taken as a whole period of time.
• B) at 2024'At' is reserved for precise clock times, and a year is a span rather than an instant of the day.
• C) in 2024Years and months are introduced by 'in', so 'in 2024' is the correct frame for an event inside that year.
• D) for 2024'For' expresses a duration the speaker measures, and not the calendar slot where an event sits.

Respuesta correcta: A) for

• A) for'For' expresses the duration of a period, and forty minutes is a length of time rather than a point.
• B) since'Since' would mark the moment the waiting began, and the sentence measures how long the wait lasted.
• C) during'During' needs the name of a period or event, such as 'during the delay' or 'during the storm'.
• D) at'At' introduces a point in time, so it would fit 'at six o'clock' and not a span of forty minutes.

Respuesta correcta: C) at / in

• A) in / atThe pair is reversed: the clock time takes 'at' and the enclosed place takes 'in'.
• B) on / at'On' would go with a surface such as 'on the stage', and 'at' cannot introduce the main hall.
• C) at / in'At' fits the hour, and an enclosed room or building is introduced by 'in', so this pair works.
• D) by / in'By' marks a deadline rather than the moment an event takes place, so it does not fit the schedule.

Respuesta correcta: C) at / on

• A) on / atThat reverses both roles: the hour is not introduced by 'on' and the platform is not introduced by 'at'.
• B) for / on'For' measures a length of time, and 6:15 is a point in the day rather than a duration.
• C) at / onA departure hour takes 'at' and a numbered platform behaves like a surface, so 'on' is the right preposition.
• D) in / in'In' introduces longer periods and enclosed spaces, so it fits neither a precise hour nor a platform.

Respuesta correcta: D) The sports day is next Friday.

• A) The sports day is on next Friday.Time expressions built with 'next' normally stand without a preposition, so 'on' is extra here.
• B) The sports day is in next Friday.'In' introduces months and years, and it cannot go with a day such as Friday.
• C) The sports day is at next Friday.'At' belongs with clock times, not with a named weekday such as Friday.
• D) The sports day is next Friday.Time expressions such as 'next Friday' normally appear with no time preposition at all.

Respuesta correcta: D) at / on

• A) at / in'At' marks a single instant, and 'in' takes months, so neither slot fits here.
• B) for / on'For' would need a measured duration, and 'on' cannot introduce a plural such as 'weekdays'.
• C) in / at'In' introduces a month or a year, and 'at' cannot introduce the plural 'weekdays'.
• D) at / onA repeated daily time takes 'at' and 'weekdays' behaves as a named day, so 'on' is right.

Respuesta correcta: B) from / on

• A) at / in'At' marks a single instant and 'in' takes months, so neither slot fits an opening hour and a weekday.
• B) from / on'From' opens an interval of time and 'on' introduces a named day, which is exactly what the notice states.
• C) for / in'For' would need a duration and 'in' belongs with a month, so the pair fails on both counts.
• D) since / at'Since' marks a starting point in an ongoing situation and 'at' cannot introduce a named day.

Respuesta correcta: C) by

• A) until'Until' marks the endpoint of a continuing activity, and here the point is when the report must arrive.
• B) since'Since' links a past starting point to a situation that still holds, which a deadline does not do.
• C) by'By' names the latest moment by which the action must be completed, which is what a due date sets.
• D) for'For' reports a length of time the speaker measures, and Friday evening is a point rather than a length.

Respuesta correcta: D) The course runs in July.

• A) The course runs on July.A named month is a period of time, and periods take 'in' rather than 'on'.
• B) The course runs at July.'At' belongs with clock times, and July names a month rather than an instant.
• C) The course runs for July.'For' measures a length of time, so it would need 'for two weeks' rather than a month.
• D) The course runs in July.Months are introduced by 'in', so this sentence places the course correctly in time.

Respuesta correcta: A) on

• A) onA named day is introduced by 'on', and Sunday is the day on which the discount ends.
• B) in'In' introduces months and years, so it cannot go with a single day such as Sunday.
• C) at'At' belongs with precise clock times, and Sunday is a calendar day rather than an instant.
• D) during'During' needs a period or an event, and 'Sunday' names a single day rather than a span.

Respuesta correcta: B) The exam is on 10 May.

• A) The exam is in 10 May.A precise calendar date is introduced by 'on' in standard use, so 'in' is the wrong choice here.
• B) The exam is on 10 May.A precise calendar date is introduced by 'on', so this sentence places the exam correctly.
• C) The exam is at 10 May.'At' is reserved for clock times, and a calendar date is not an instant of the day.
• D) The exam is for 10 May.'For' reports a duration the speaker measures, and not the day on which an event takes place.

Respuesta correcta: B) Our holiday starts next July.

• A) Our holiday starts in next July.Time expressions built with 'next' normally stand alone, so a preposition here is unnecessary.
• B) Our holiday starts next July.An expression such as 'next July' normally appears with no preposition, so this is the correct form.
• C) Our holiday starts on next July.'On' goes with a day or a date, and July is a month, so the pair does not match.
• D) Our holiday starts at next July.'At' is reserved for precise clock times, and it cannot introduce a month such as July.

Respuesta correcta: A) from ... to

• A) from ... to'From' opens the interval and 'to' gives its endpoint, so the two halves of the class are placed correctly.
• B) at ... in'At' marks a single instant and 'in' takes months or years, so the pair cannot name the two ends of one interval.
• C) since ... untilBoth prepositions describe an ongoing situation, and neither one opens a scheduled interval that ends at 8 a.m.
• D) for ... to'For' would need a measured length of time, and it cannot be followed by 'to' to close the interval.

Respuesta correcta: B) on

• A) in'In' introduces a month or a year on its own, so it cannot carry the full day, month and year of a date.
• B) onA calendar date is introduced by 'on', which is why the poster reads 'on Saturday 15 March'.
• C) at'At' introduces a clock time such as 8 p.m., and the poster already uses it for the hour.
• D) for'For' reports a measured duration, and a concert date is not a length of time.

Respuesta correcta: B) at

• A) in'In' introduces a span such as a month or a year, and it cannot mark a new clock time.
• B) atA replacement clock time is introduced by 'at', so the concert now takes place at 8 p.m.
• C) on'On' goes with days and dates, and the new time here is an hour rather than a calendar day.
• D) until'Until' marks the endpoint of a continuing activity, and it does not assign a new starting time.

Respuesta correcta: A) She has studied English for three years.

• A) She has studied English for three years.'For' states how long the activity has lasted, and three years is a length of time.
• B) She has studied English since three years.'Since' takes a starting point such as a year or a month, and it cannot be combined with a length.
• C) She has studied English in three years.'In' would place the whole activity inside a closed span and would leave the present situation unstated.
• D) She has studied English at three years.'At' introduces precise clock times, and a length of three years is not an instant of the day.

Respuesta correcta: A) in

• A) in'In' introduces a span of time such as a week, and the last week of June is such a span.
• B) at'At' marks a precise instant such as a clock time, and a whole week is not an instant.
• C) on'On' goes with a single day or a date, and it does not normally introduce a week.
• D) for'For' measures a length the speaker reports, and here the phrase already names the span with 'the last week'.