Here's a breakdown:
Subject-First Sentences:
* Standard and Clear: This is the typical structure in English, making sentences easier to understand.
* Direct and Focused: It emphasizes the subject and its action or state of being.
* Examples: "The cat sat on the mat." "She went to the store."
Non-Subject-First Sentences:
* Emphasis and Variety: Starting with other parts of speech like adverbs, prepositions, or conjunctions can add emphasis, create a sense of urgency, or provide variety.
* Stylistic Choices: These can be used for literary effect, but overuse can be jarring or confusing.
* Examples: "Suddenly, the lights went out." "On the other side of the mountain, a hidden valley lay waiting."
Important Note:
* While not grammatically incorrect, starting a sentence with a preposition (like "in" or "on") is often considered informal or overly casual.
Ultimately, whether you begin a sentence with the subject depends on your purpose and the desired effect. Choose the structure that best fits the context and your writing style.