Prepositions Time

Respuesta correcta: A) from / to

• A) from / to'From ... to' is the standard pattern for stating a starting and an ending point.
• B) in / in'In' marks a period or a year, not the limits of an interval.
• C) for / till'For' introduces a duration, and 'till' only gives the end point.
• D) since / until'Since' indicates an origin in time, which is not what the sentence states.

Respuesta correcta: B) since

• A) for'For' would introduce a duration such as 'for nine years', not a single year as origin.
• B) since'Since' marks the origin of a situation that still holds.
• C) during'During' marks a period of time when something happens, not an origin that continues.
• D) till'Till' gives an endpoint, not a starting point.

Respuesta correcta: A) By six o'clock I will have finished the report.

• A) By six o'clock I will have finished the report.'By' plus a deadline is the standard future perfect pattern.
• B) By six o'clock I finish the report.'By' requires the future perfect in this structure, not the simple future.
• C) By of six o'clock I will finish the report.The preposition 'of' does not belong after 'by' in a time phrase.
• D) By six o'clock in the report I will finish.The word order makes the sentence ungrammatical.

Respuesta correcta: B) at

• A) until'Until' would mark the limit of the waiting, not the place.
• B) at'At the entrance' names the specific point where the waiting happens.
• C) for'For' introduces a duration and cannot precede a noun phrase of place.
• D) while'While' introduces a subordinate clause, not a noun phrase.

Respuesta correcta: B) 'At' with hours, 'on' with days, 'in' with longer periods

• A) All three are interchangeable in every contextThe choice depends on the length and type of the time expression.
• B) 'At' with hours, 'on' with days, 'in' with longer periodsThat is the standard hierarchy of time prepositions.
• C) 'In' is only used for the past'In' covers months, years and future periods as well.
• D) 'On' is only used with dates'On' is also used with days of the week and parts of the day.

Respuesta correcta: D) in / in

• A) at / in'At' is used for specific points, not for cities.
• B) to / on'To' would require a verb of motion, and 'on' does not mark a month.
• C) in / at'At March' is incorrect; months take 'in'.
• D) in / in'In Lima' for a city and 'in March' for a month are both correct.

Respuesta correcta: D) since

• A) for'For 2019' would need 'for six years'; a bare year takes 'since'.
• B) from'From' marks a starting point but does not convey the continuing meaning here.
• C) during'During' marks a period of occurrence, not an ongoing situation.
• D) since'Since 2019' marks the origin of an ongoing situation.

Respuesta correcta: A) The library stays open until nine.

• A) The library stays open until nine.'Until nine' marks the moment the closing stops.
• B) The library stays open at nine.'At' would name a single instant rather than a limit.
• C) The library stays open for nine.'For' would indicate a duration instead of an endpoint.
• D) The library stays open since nine.'Since' marks an origin, the opposite relation.

Respuesta correcta: C) The action happened inside a defined period

• A) The action started at that point and continuesThat is the function of 'from' or 'since'.
• B) The action will happen in the futureFuture reference requires 'in' plus a future period.
• C) The action happened inside a defined period'During the holiday' locates the event within that period.
• D) The action lasted a fixed durationDuration is expressed with 'for'.

Respuesta correcta: C) The class starts on Monday at eight in the morning.

• A) The class starts in Monday at eight in the morning.Days of the week take 'on', not 'in'.
• B) The class starts on Monday in eight on the morning.'In' cannot be used with a clock time or with 'the morning'.
• C) The class starts on Monday at eight in the morning.Each element takes the preposition its own type requires.
• D) The class starts for Monday at eight on the morning.'For' introduces a duration and cannot precede a day as a time marker.

Respuesta correcta: D) 'Since' must be 'for' when followed by a duration

• A) Nothing is wrong with the sentence'Since' plus a duration is a standard error.
• B) 'Waiting' must be 'waited''Have been waiting' is the correct progressive perfect form.
• C) 'Two hours' must be 'two hour''Two hours' is correct for a plural duration.
• D) 'Since' must be 'for' when followed by a duration'For two hours' expresses the waiting period correctly.

Respuesta correcta: C) On 30 June

• A) On 28 JuneThat is the starting date, not the ending one.
• B) On 1 JulyThat would require four days to reach the end of June.
• C) On 30 JuneCounting three days from 28 June gives the end on 30 June.
• D) On 28 JulyThe month stated in the text is June, not July.

Respuesta correcta: D) The exam is on Friday.

• A) The exam is in Friday.Days of the week take 'on', not 'in'.
• B) The exam is at Friday.'At' is used for clock times and specific points.
• C) The exam is to Friday.'To' would require a verb of motion or a range.
• D) The exam is on Friday.Days of the week take the preposition 'on'.

Respuesta correcta: C) from / till

• A) in / in'In' does not link two clock times as limits.
• B) for / until'For' introduces a duration rather than the opening and closing limits.
• C) from / till'From ... till' is the natural pattern for a narrow time interval.
• D) at / at'At' marks single instants, not an interval between two times.

Respuesta correcta: B) It marks the exact hour, with no minutes

• A) It marks a duration of one hour'O'clock' marks a clock reading, not a length of time.
• B) It marks the exact hour, with no minutes'O'clock' is used only when the minutes are zero.
• C) It indicates a period in the morning'In the morning' marks that period, not 'o'clock'.
• D) It indicates a rough approximation'O'clock' indicates an exact time, not an approximation.

Respuesta correcta: A) Since the museum opened, it has attracted many visitors.

• A) Since the museum opened, it has attracted many visitors.'Since' plus the present perfect links a past opening to a present result.
• B) Since the museum opens, it attracted many visitors.The simple past does not fit the present result implied by 'since'.
• C) Since the museum opened, it attracts many visitors.The simple present would fit 'since' only with a permanent state, which is unusual here.
• D) For the museum opened, it has attracted many visitors.'For' introduces a duration and cannot precede the opening event.

Respuesta correcta: D) How long have you been studying here?

• A) How long you have been studying here?The auxiliary is in the wrong position in this question.
• B) How long did you study here?That asks about a completed past period.
• C) How long are you studying here?The present continuous does not carry the duration reading.
• D) How long have you been studying here?'How long' plus 'have you been' asks about a period continuing to the present.

Respuesta correcta: C) During the winter holidays

• A) Before the winter holidaysNothing in the sentence indicates an earlier date.
• B) After the winter holidaysThe sentence does not place the event after the holidays.
• C) During the winter holidays'During' places the event inside the stated period.
• D) Until the winter holidays'Until' would mark an endpoint rather than a period of occurrence.

Respuesta correcta: A) on

• A) on'On Friday at noon' names the exact deadline.
• B) in'In Friday' is not a valid combination in standard English.
• C) during'During Friday' would suggest an event happening through the whole day, not a deadline.
• D) while'While' introduces a clause and cannot precede a noun phrase.

Respuesta correcta: B) since

• A) for'For 1998' would need 'for twenty-six years'; a bare year requires 'since'.
• B) since'Since 1998' marks the origin of a situation that still continues.
• C) from'From' marks a starting point but loses the ongoing sense.
• D) during'During' marks a period when something occurs, not an ongoing situation.