Understanding the Correct Answer: "for"
In the sentence "She has been working here _________ five years," the correct option is "for." Here's a detailed explanation of why "for" is the appropriate choice.
Usage of "for"
- "For" is used to express the duration of time.
- It indicates a continuous period, showing how long an action has taken place.
Examples of "for"
- "I have lived in this city for ten years."
- "He has studied English for six months."
Usage of "since"
- "Since" is used to indicate a specific point in time when an action started.
- It is followed by a date or a specific moment.
Examples of "since"
- "I have lived in this city since 2010."
- "She has worked here since last summer."
Why "at" and "from" are Incorrect
- "At" is not used for expressing duration; it denotes a specific location or time.
- "From" indicates the starting point of an action and is not suitable for expressing duration without a specific endpoint.
Conclusion
In summary, when discussing how long someone has been engaged in an activity, "for" is the correct preposition to use. Thus, the complete sentence reads: "She has been working here for five years."