What are the 12 basic rules of English grammar?

The 12 Essential Rules of English Grammar: A Simple Guide

While there’s no single official list of “12 rules” of English grammar, most experts agree on a core set of principles that form the backbone of clear, correct writing. These aren’t rigid laws but essential guidelines that help us communicate effectively.

Subject-verb agreement is fundamental: a singular subject takes a singular verb, and a plural subject takes a plural one. For example, “She runs” is correct, not “She run.” Another key rule is the proper use of articles—choose “a” before consonant sounds and “an” before vowel sounds, like “a cat” or “an apple.”

Pronouns must clearly match their antecedents in number and gender. Saying “Everyone should bring their book” may be common in speech, but in formal writing, consistency matters—many prefer “his or her book” for precision. Also, avoid run-on sentences by properly joining clauses with conjunctions or punctuation.

Another often-overlooked rule is parallel structure in lists: “She likes hiking, swimming, and to run” breaks the pattern; “hiking, swimming, and running” flows better. Modifiers should be placed close to the words they describe to prevent confusion—don’t say “I almost failed the test” if you mean you barely passed.

Mastering basics like capitalization, pronoun case (I vs. me), and verb tenses keeps your writing clear and logical. For instance, mixing past and present tenses without reason can confuse readers. And don’t forget prepositions—small as they are, they shape meaning. You arrive “at” a destination, not “in” it (unless you're inside).

These rules aren’t about perfection—they’re tools. Once understood, they allow for flexibility and even creative breaks when style calls for it. After all, even Shakespeare bent the rules. But first, you’ve got to know them.