Master English Grammar Rules

Learn every essential grammar rule with clear explanations, real examples, and personalized practice quizzes. Improve your writing at any level—from student essays to professional documents.

All Grammar Rules

Explore 22 essential rules to improve your English writing skills

Beginner
Verb Tenses

Past Simple Tense

Used to describe actions that are completely finished in the past.

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Beginner
Verb Tenses

Present Simple Tense

Describes an obvious truth, a habit, or a repeated action.

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Beginner
Verb Tenses

Future Tense

Describes an action that will happen. In IELTS, it is often used for predictions or plans.

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Beginner
Verb Tenses

Incorrect Verb Tense

Using a tense that does not fit the time context of the sentence.

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Beginner
Verb Tenses

Subject-Verb Agreement

The verb must agree with the number (singular/plural) of the subject.

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Beginner⛓️
Sentences

Run-on Sentence

Two independent clauses joined together without proper conjunctions or punctuation.

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Beginner
Punctuation

Comma Splice

Joining two complete sentences with only a comma (a comma alone is not strong enough for this).

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Beginner⛓️
Sentences

Sentence Fragment

An incomplete sentence missing a subject, a main verb, or a dependent clause standing alone.

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⭐⭐ Intermediate📖
Articles

Article Usage (A/An/The)

Incorrect or missing article before a noun.

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⭐⭐ Intermediate🔗
Prepositions

Prepositions (In/On/At)

Incorrect use of prepositions for place, time, or verbs.

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⭐⭐ Intermediate📝
Grammar

Singular / Plural Nouns

Forgetting to pluralize a countable noun or incorrectly adding an 's' to an uncountable noun.

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⭐⭐ Intermediate↔️
Word Order

Word Order

Words arranged in the wrong position within a sentence.

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⭐⭐ Intermediate📝
Grammar

Passive Voice Errors

Using active voice when passive is needed, or forming the passive structure incorrectly.

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⭐⭐ Intermediate📝
Grammar

Incorrect Word Choice

Choosing vocabulary that is grammatically correct but contextually inappropriate or unnatural.

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⭐⭐ Intermediate📝
Grammar

Spelling Mistakes

Writing a word with incorrect characters.

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⭐⭐ Intermediate
Punctuation

Punctuation Errors

Incorrect use of commas, periods, semicolons, or missing punctuation.

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⭐⭐⭐ Advanced📝
Grammar

Capitalization Errors

Failing to capitalize the start of a sentence or proper nouns, or randomly capitalizing words mid-sentence.

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⭐⭐⭐ Advanced📝
Grammar

Informal Language

Using slang, contractions, or spoken language in academic writing.

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⭐⭐⭐ Advanced📝
Grammar

Word Repetition

Using the exact same word too many times in a short span.

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⭐⭐⭐ Advanced📝
Grammar

Incorrect Word Form

Confusing parts of speech: Nouns, Verbs, Adjectives, and Adverbs.

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⭐⭐⭐ Advanced📝
Grammar

Collocation Errors

Failing to pair words that naturally go together in English.

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⭐⭐⭐ Advanced📝
Grammar

Other Errors

Errors that do not fit into specific grammatical categories or involve logical phrasing issues.

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Frequently Asked Questions

How do I use these grammar rules?

Each rule page includes definitions, examples of correct and incorrect usage, and tips. Use them as reference while writing or practicing AI-generated quizzes.

Are these rules useful for my level?

Yes! Rules are organized by difficulty level (Beginner, Intermediate, Advanced) and apply to academic, professional, and general writing—perfect for students, ESL learners, and professionals.

Can I practice these rules?

Absolutely. Each rule links to AI-powered practice quizzes that adapt to your learning. Get 6 quizzes/day free, unlimited with Pro access.

How often are new rules added?

We regularly add new rules based on common writing errors from real user submissions. Check our changelog for the latest updates.