π€ English Grammar Guide
English grammar is the traffic rules of the language. Especially tense and modal verbs (can/could/would/should) are not just rules to memorize but signals about timing, certainty, and relationship that change the meaning entirely.
Grammar is not a list of rules to memorize β it is the operating system of language. Understanding why sentences are built the way they are helps you write more clearly, read more accurately, and avoid errors that confuse readers. The same logical structures appear across writing, speaking, and standardized tests. Once you understand the principles, you can analyze any sentence, not just the ones you have memorized.
- 8 Parts of Speech: Noun Β· Pronoun Β· Verb Β· Adjective Β· Adverb Β· Preposition Β· Conjunction Β· Interjection
- SubjectβVerb Agreement: singular subject β singular verb, plural β plural. Watch for collective nouns and compound subjects
- Sentence types: Simple Β· Compound (FANBOYS) Β· Complex (subordinating conjunctions) Β· Compound-complex
- Comma rules: after intro clause, around non-essential info, before coordinating conjunction in compound sentence
- Common errors: run-ons, fragments, misplaced modifiers, pronoun-antecedent agreement
1. Parts of Speech
Every word in English belongs to a part of speech β a category that describes how the word functions in a sentence.
- Noun: names a person, place, thing, or idea. dog, city, freedom, Maria
- Pronoun: replaces a noun. he, she, it, they, we, who, which
- Verb: expresses action or state of being. run, think, is, become
- Adjective: modifies a noun or pronoun. tall, blue, three, excited
- Adverb: modifies a verb, adjective, or another adverb. quickly, very, often, here
- Preposition: shows relationship between words. in, on, at, under, between, after
- Conjunction: connects words, phrases, or clauses. and, but, or, because, although
- Interjection: expresses strong emotion. Wow! Oh! Hey!
Nouns β Types and Cases
- Common vs. Proper: city vs. New York (proper nouns are capitalized)
- Concrete vs. Abstract: table vs. justice
- Singular vs. Plural: cat β cats, child β children, mouse β mice
- Possessive: add 's for singular: the dog's bone; add s' for plural: the students' books
Verbs β Tenses
| Tense | Example |
|---|---|
| Simple Present | She walks to school. |
| Simple Past | She walked to school. |
| Simple Future | She will walk to school. |
| Present Progressive | She is walking to school. |
| Past Perfect | She had walked before it rained. |
| Future Perfect | She will have walked by noon. |
2. Sentence Structure
Every complete sentence must have a subject (who or what) and a predicate (what the subject does or is).
Four Sentence Types by Structure
- Simple sentence: one independent clause. The dog barked.
- Compound sentence: two independent clauses joined by a coordinating conjunction (FANBOYS) or semicolon. The dog barked, and the cat ran away.
- Complex sentence: one independent clause + one or more dependent clauses. Although it was raining, we went outside.
- Compound-complex sentence: two independent clauses + at least one dependent clause. Although it was raining, we went outside, and we got soaked.
Phrases vs. Clauses
- Phrase: a group of words without a subject-verb pair. on the table, running quickly
- Independent clause: has subject + verb and expresses a complete thought. Can stand alone as a sentence.
- Dependent (subordinate) clause: has subject + verb but does NOT express a complete thought. Cannot stand alone. Begins with a subordinating conjunction: because, although, when, if, since, while, unlessβ¦
3. Subject-Verb Agreement
A verb must agree with its subject in number (singular or plural).
- Singular subject β verb ends in -s: The dog runs.
- Plural subject β verb does NOT end in -s: The dogs run.
- Compound subjects with "and": use plural verb. Tom and Jerry are friends.
- Compound subjects with "or/nor": verb agrees with the closer subject. Neither the players nor the coach was ready.
- Indefinite pronouns: each, every, everyone, nobody, someone β singular. Everyone is here.
- Collective nouns: usually singular. The team wins often.
4. Punctuation
Commas
- Before a coordinating conjunction joining two independent clauses: I wanted to go, but it was raining.
- After an introductory word/phrase/clause: However, the results were clear.
- To separate items in a series (Oxford comma): eggs, butter, and milk
- To set off nonessential (nonrestrictive) clauses: My sister, who lives in Paris, called me.
Semicolons and Colons
- Semicolon: joins two closely related independent clauses without a conjunction. The sun set; the stars appeared.
- Colon: introduces a list, explanation, or quotation that follows an independent clause. I need three things: flour, eggs, and butter.
Apostrophes
- Contractions: don't (do not), it's (it is / it has)
- Possessives: the teacher's desk (singular), the teachers' lounge (plural)
- Never use an apostrophe for plural nouns: three dogs β (NOT three dog's)
- its vs. it's: its = possessive pronoun; it's = it is
5. Common Grammar Errors to Avoid
- Run-on sentence: two independent clauses joined incorrectly. Fix with a period, semicolon, or conjunction.
- Comma splice: two independent clauses joined only by a comma. I was tired, I took a nap. β Fix: I was tired, so I took a nap.
- Sentence fragment: incomplete thought missing subject or verb. Running down the street. β Fix: She was running down the street.
- Dangling modifier: the modifier does not logically attach to what it modifies. Running late, my coffee was spilled. β Fix: Running late, I spilled my coffee.
- their / there / they're: possessive / location / they are
- your / you're: possessive / you are
- affect / effect: affect = verb (to influence); effect = noun (result)
6. Active and Passive Voice
Voice shows whether the subject performs the action (active) or receives the action (passive).
- Active voice: Subject β Verb β Object. Clear, direct, and preferred in most writing.
The chef cooked the meal. - Passive voice: Object becomes subject; uses "to be" + past participle. Used when the doer is unknown, unimportant, or deliberately omitted.
The meal was cooked (by the chef).
When to use passive voice:
- The actor is unknown: My wallet was stolen.
- The actor is unimportant: The report was submitted on time.
- Scientific/formal writing: The solution was heated to 100Β°C.
- Active β Passive: Dogs chase cats. β Cats are chased by dogs.
- Active β Passive: Someone left the door open. β The door was left open.
7. Verb Moods
- Indicative mood: states facts or asks questions. Most common.
She studies every night. / Does he know the answer? - Imperative mood: gives commands or requests.
Study the chapter. / Please close the door. - Subjunctive mood: expresses wishes, hypotheticals, or conditions contrary to fact. Uses past tense or "were" for all subjects.
If I were you, I would apologize. / I wish she were here.
The teacher requires that every student be on time. (formal subjunctive after "that")
π Practice Problems
Exercise 1 β Parts of Speech
Identify the part of speech of each underlined word.
- She runs quickly every morning. β ( )
- The ancient ruins stood on a hill. β ( )
- Wow! That was amazing. β ( )
- Neither Tom nor Sara arrived on time. β ( )
- The cat sat under the table. β ( )
βΆ Show Answers
1. Adverb 2. Adjective 3. Interjection 4. Conjunction (correlative) 5. Preposition
Exercise 2 β Subject-Verb Agreement
Choose the correct verb form for each sentence.
- The list of items (was / were) long.
- Neither the students nor the teacher (know / knows) the answer.
- Everyone on the teams (is / are) ready to compete.
- The jury (has / have) reached a verdict. (collective noun)
βΆ Show Answers
1. was (subject = "list," singular) 2. knows (verb agrees with nearer subject "teacher") 3. is (everyone = singular) 4. has (collective noun treated as a unit)
Exercise 3 β Sentence Structure
Label each sentence: Simple (S), Compound (Cd), Complex (Cx), or Compound-Complex (CC).
- "The dog barked loudly." β ( )
- "I wanted to stay, but it was getting late." β ( )
- "Although she was tired, she finished the report." β ( )
- "Because the storm arrived early, we cancelled the game, and everyone went home." β ( )
βΆ Show Answers
1. Simple 2. Compound 3. Complex 4. Compound-Complex
Exercise 4 β Punctuation Correction
Find and fix the punctuation error in each sentence.
- Its a beautiful day outside.
- I need three things flour eggs and butter.
- She studied all night however she still failed the exam.
- Running late, my keys were dropped at the door.
βΆ Show Answers
1. It's a beautiful day (it's = it is, needs apostrophe)
2. I need three things: flour, eggs, and butter. (colon before list; Oxford comma)
3. She studied all night; however, she still failed. (semicolon before conjunctive adverb)
4. Running late, I dropped my keys at the door. (dangling modifier fixed)
Basic Q. "I have lost my key." Which present perfect usage is this? A) Experience B) Completion C) Continuity
Show answer
Intermediate Q. Fill in the blank: "She ___ here since 2020." (use: live)
Show answer
Advanced Q. Explain the tense structure and meaning of: "If I had studied harder, I would have passed."
Show answer
Review this material at increasing intervals to commit it to long-term memory.