Understanding the Correct Preposition
When discussing proficiency or skill in a subject, the choice of preposition is key to conveying the right meaning. In this case, the correct answer is "at."
Why "at" is the Correct Choice
- Indication of Skill: The preposition "at" is commonly used to indicate someone’s skill level in a specific activity or subject. Saying someone is "good at" something implies they have a certain level of competence or talent in that area.
- Common Usage: In English, we frequently use "good at" when referring to skills in various domains. For example:
- She is good at painting.
- He is good at playing the guitar.
Other Options Explained
- "In": This preposition can indicate a field of study or a location but does not convey the same sense of skill. For example, "in mathematics" describes a subject but doesn’t imply proficiency.
- "With": This preposition suggests a companionship or a manner of doing something. Saying "good with mathematics" might imply someone is pleasant or effective when interacting with mathematical problems, but it lacks the directness of skill.
- "For": This preposition generally indicates purpose or suitability, such as "good for a job." It does not convey skill or proficiency in a subject.
Conclusion
In summary, the phrase "good at mathematics" correctly expresses someone’s proficiency in the subject. Understanding the nuances of prepositions enhances clarity in communication and helps convey the intended message effectively.