Common grammar rules to help improve your understanding of English:

1. Subject-Verb Agreement: The subject and verb must agree in number (singular or plural).

Example: "She writes a letter." (singular)

"They write letters." (plural)

2. Use of Articles (a, an, the):

"A": Used before words starting with a consonant sound.

Example: "I saw a dog."

"An": Used before words starting with a vowel sound.

Example: "I ate an apple."

"The": Used when referring to something specific or previously mentioned.

Example: "I saw the dog we talked about."

3. Tense Consistency: Keep the same tense throughout a sentence or passage unless a shift in time is necessary.

Example: "She went to the store and bought some bread." (past tense)

4. Pronouns: Pronouns must agree with their antecedents in number, gender, and person.

Example: "The teacher she explained the lesson." (correct: "She explained the lesson.")

Example: "The students are excited because they are going on a trip."

5. Prepositions: Use the correct preposition for the action or direction indicated.

Example: "I will meet you at the station."

Example: "She is sitting on the chair."

6. Adjective Order: When using multiple adjectives before a noun, follow the typical order: Quantity/Opinion/Size/Age/Shape/Color/Proper adjective/Material/Origin.

Example: "She wore a beautiful small round green Italian leather bag."

7. Double Negatives: In standard English, double negatives are generally avoided, as they create a positive meaning.

Example: "I don't need any help." (not "I don't need no help.")

8. Punctuation:

Use commas to separate items in a list or after introductory phrases.

Example: "I bought apples, bananas, and grapes."

Use periods at the end of declarative sentences.

Use question marks for direct questions.

Use exclamation marks for strong emotions.

9. Use of Conjunctions: Conjunctions are used to link ideas, clauses, or sentences. Common conjunctions include "and," "but," "or," "because," and "so."

Example: "I wanted to go, but I was tired."

10. Correct Use of Adverbs: Adverbs modify verbs, adjectives, or other adverbs. They often end in "-ly."

Example: "She sings beautifully."

Example: "He is extremely tired."

Mastering these grammar rules helps create more accurate and effective communication in English.