Understanding Prepositions of Time: 'Since' and 'For'

Prepositions are words that link a noun, pronoun, or phrase to other words in a sentence. They often indicate relationships of location, direction, time, or manner. In this question, we need to identify the sentence that correctly uses a preposition to indicate a point in time with the present perfect continuous tense ("We have been playing...").

Analyzing Preposition Usage in Sentences

Let's look at each sentence and evaluate the appropriateness of the preposition used with the time expression "4 o'clock" in the context of "We have been playing...". The present perfect continuous tense is used for an action that started in the past and continues up to the present moment or has just stopped, often emphasizing the duration or continuity.

• Option 1: "We have been playing for 4 o’clock."

  The preposition 'for' is typically used to indicate a duration of time (e.g., for two hours, for a week, for a long time). It specifies how long an action has lasted. Using 'for' with a specific point in time like "4 o'clock" is incorrect. You would say "for four hours" if that was the duration, but not "for 4 o'clock".

• Option 2: "We have been playing from 4 o’clock."

  The preposition 'from' indicates a starting point. While 'from' can be used with a time (e.g., "The shop is open from 9 am"), it is less commonly and appropriately used with the present perfect continuous tense to indicate the start of an action that continues up to the present. 'Since' is the standard and more natural choice in this grammatical construction when specifying the starting point in the past.

• Option 3: "We have been playing to 4 o’clock."

  The preposition 'to' usually indicates an ending point (e.g., from 9 am to 5 pm). In the context of "We have been playing...", saying "to 4 o'clock" would imply that the playing stopped at 4 o'clock, which doesn't fit the typical usage of the present perfect continuous tense which describes an action continuing up to the present or recently completed. If the intention was that the action continued until 4, "until" would be more appropriate, but "to" is generally incorrect here.

• Option 4: "We have been playing since 4 o’clock."

  The preposition 'since' is used to indicate a specific point in time in the past when an action or state began, and it has continued up to the present. This is exactly the function required when using the present perfect or present perfect continuous tense with a specific past time reference. "Since 4 o'clock" correctly indicates that the playing started at 4 o'clock and has continued until now.

Conclusion on Correct Preposition Use

Based on the analysis, the sentence that uses the preposition appropriately with the present perfect continuous tense and a specific point in time is the one using 'since'. The structure "present perfect continuous + since + specific point in time" is a standard way to express an action that started at that point in the past and continues.

Revision Table: Prepositions of Time with Present Perfect/Continuous

Additional Information on Time Prepositions

While 'since' and 'for' are commonly used with perfect tenses, other prepositions of time like 'at', 'in', and 'on' are used differently:

• At: Used for specific times (at 3 pm, at noon), holidays (at Christmas), and weekends (at the weekend - UK English).
• In: Used for longer periods (in the morning, in the afternoon, in the evening), months (in July), seasons (in winter), years (in 2023), decades (in the 1990s), centuries (in the 21st century), and future times (in five minutes).
• On: Used for specific days of the week (on Monday), specific dates (on July 15th), and specific parts of a day when a date is mentioned (on Sunday morning).

Understanding these different uses helps clarify which preposition is appropriate for various time expressions and sentence structures.