What should sentences always begin with?

Sentences should always begin with a capital letter because this convention helps indicate the start of a new thought or idea. Using a capital letter at the beginning of a sentence signals to the reader that they should pay attention to the new information being presented. This practice is a fundamental rule of grammar and punctuation that aids in the clarity and readability of text. It creates a uniform structure in writing, making it easier for readers to follow along.

The use of a capital letter at the beginning of a sentence also aligns with the rules of standard written English, reinforcing the importance of following these conventions in both formal and informal writing contexts. This approach not only enhances communication but also fosters better understanding among readers.