🧐 Common Errors in English for Competitive Exams: 50+ Rules to Spot & Fix Grammatical Mistakes

By [Your Name/Website Name] | Updated: August 2026

Imagine this: You are solving the “Error Detection” section of your paper. You read the sentence: “The sceneries of Kashmir are very beautiful.” It sounds perfectly fine to your ears, right?

Wrong!

In English, “scenery” is an uncountable noun (it has no plural). The correct sentence is: “The scenery of Kashmir is very beautiful.”

This single error—worth 1 or 2 marks—can be the difference between selection and rejection. In competitive exams, examiners are notorious for hiding these grammatical landmines in seemingly simple sentences.

In this blog, we will decode the most frequently repeated grammatical errors in exams, provide crystal-clear Hindi explanations, and give you a last-minute revision chart to ace the “Spotting Errors” section. Let’s begin! 🚀

📌 Rule 1: Subject-Verb Agreement (कर्ता-क्रिया समानता) – The King of Errors

This is the single most tested topic. The verb must always agree with its actual subject in number (Singular/Plural).

Key Traps to Watch For:

Rule	Explanation (Hindi)	Incorrect ❌	Correct ✅
1. Collective Nouns	Collective nouns (Team, Jury, Committee, Police, Scenery, News) are singular.	The jury were divided in its opinion.	The jury was divided in its opinion. (यदि एक इकाई के रूप में कार्य कर रहे हों) (Note: If members act individually, use plural, but the singular is safer for exams).
2. Additive Phrases	Along with, together with, as well as, in addition to do NOT change the verb. The verb agrees with the first noun.	Ram, along with his friends, are coming.	Ram, along with his friends, is coming. (Ram के साथ ‘along with’ जुड़ा है, मूल कर्ता Ram है)
3. Either/Neither – Or/Nor	The verb agrees with the noun closest to the verb.	Either the manager or his assistants is on leave.	Either the manager or his assistants are on leave. (‘assistants’ के साथ verb आएगा)
4. Indefinite Pronouns	Words like Everyone, Somebody, Nobody, Each, Either, Neither are always singular.	Everyone have completed their work.	Everyone has completed his/her work. (Everyone singular है)
5. Nouns that look plural but are singular	Mathematics, Physics, Economics, News, Politics end with ‘s’ but are singular.	Mathematics are my favorite subject.	Mathematics is my favorite subject.

🕰️ Rule 2: Tense & Sequence of Time (काल संबंधी त्रुटियाँ)

Examiners love mixing past, present, and future incorrectly.

Rule	Explanation (Hindi)	Incorrect ❌	Correct ✅
1. Since vs. For	Since + Point of time (2010, Monday, 2 o’clock). For + Duration of time (2 hours, 10 years).	I am working here for 2015.	I have been working here since 2015. (Perfect Continuous tense required)
2. Conditional Sentences	With ‘If’ (Possibility): If + Present, Future (will). With ‘If’ (Imagination): If + Past, would.	If I will go to Delhi, I will meet you.	If I go to Delhi, I will meet you. (If clause में ‘will’ नहीं आता)
3. Past Tense Sequence	If the main verb is in the past tense, the subordinate clause must usually be in the past.	He told me that he is sick.	He told me that he was sick. (Reporting verb ‘told’ past में है)
4. Present Perfect vs. Past	Present Perfect (has/have V3) is used for recent/unspecified past. Past Simple is for definite past.	I have received your letter yesterday.	I received your letter yesterday. (‘yesterday’ definite time है, इसलिए Past Simple)

📍 Rule 3: Preposition Pitfalls (पूर्वसर्ग संबंधी त्रुटियाँ)

Prepositions are small but mighty. One wrong preposition can change the entire meaning.

Rule	Explanation (Hindi)	Incorrect ❌	Correct ✅
1. Agree to vs. Agree with	Agree to + Idea/Proposal. Agree with + Person.	I agree to you on this matter.	I agree with you on this matter.
2. Die of vs. Die from	Die of + Disease (cholera, cancer). Die from + Injury/Wound.	He died from cancer.	He died of cancer. (बीमारी के लिए ‘of’)
3. Insist / Persist	Insist on (किसी चीज़ पर जोर देना). Persist in (ज़िद करना).	He insisted for going there.	He insisted on going there.
4. Different from	We say Different from, NOT Different than.	My book is different than yours.	My book is different from yours.
5. Look after / Look at	Look after = देखभाल. Look at = देखना (किसी ओर).	Please look on my pet.	Please look after my pet.

🅰️ Rule 4: Articles (A, An, The) – The Invisible Traps

Articles are a major source of silly mistakes.

Rule	Explanation (Hindi)	Incorrect ❌	Correct ✅
1. Superlatives & Ordinals	Use the before superlative degrees (best, tallest) and ordinal numbers (first, last).	He is a best student in the class.	He is the best student in the class.
2. Unique Things	Use the before things that are one of a kind (sun, moon, earth, sky).	A sun rises in the east.	The sun rises in the east.
3. Plural Nouns (General Sense)	Do NOT use ‘the’ before plural countable nouns when speaking in a general sense.	The dogs are faithful animals. (यहाँ सभी कुत्तों की बात हो रही है)	Dogs are faithful animals. (सामान्य अर्थ में ‘the’ नहीं)
4. Before Proper Nouns	Do NOT use ‘the’ before names of people, cities, or most countries.	The Amitabh is a great actor.	Amitabh is a great actor.
5. Before Musical Instruments	Use the before musical instruments (when talking about playing them).	She plays a guitar.	She plays the guitar.

🔗 Rule 5: Correlative Conjunctions & Parallelism (समानांतरता)

When you use pairs like Not only…but also, Neither…nor, Either…or, the words that follow them must be of the same grammatical structure.

Rule	Explanation (Hindi)	Incorrect ❌	Correct ✅
Parallel Structure	If ‘not only’ is followed by a verb, ‘but also’ must be followed by a verb. If it is followed by a noun, ‘but also’ must be followed by a noun.	She not only dances but also singing. (Verb + Gerund – mismatch)	She not only dances but also sings. (Verb + Verb – match)
Neither / Either	Ensure correct placement.	He neither helps nor helping anyone.	He neither helps nor helps anyone. (or simply: He neither helps anyone nor does he help himself). Best: He neither helps nor supports.

🔀 Rule 6: Commonly Confused Words (अक्सर भ्रमित करने वाले शब्द)

Examiners love to replace a word with its close relative to trap you.

Pair	Meaning (English)	Meaning (Hindi)	Trick to Remember
Affect / Effect	Affect = Verb (to influence). Effect = Noun (Result).	Affect = प्रभावित करना Effect = परिणाम	Affect = Action (Verb). Effect = End result (Noun).
Beside / Besides	Beside = Next to. Besides = In addition to.	Beside = बगल में Besides = के अलावा	Besides has an extra ‘s’ = extra thing.
Than / Then	Than = Used for comparison. Then = At that time / Next.	Than = की तुलना में Then = तब / फिर	Both have ‘e’ but compare ‘a’ in than (comparison).
Loose / Lose	Loose = Not tight (ढीला). Lose = Misplace / Fail to win (खोना).	Loose = ढीला Lose = हारना/खोना	Loose has two ‘o’s (looks loose). Lose has one ‘o’.
Advice / Advise	Advice = Noun (सलाह). Advise = Verb (सलाह देना).	Advice = सलाह (वस्तु) Advise = सलाह देना (क्रिया)	‘c’ sounds like ‘s’ in noun. ‘s’ sounds like ‘z’ in verb.

🧠 Rule 7: Dangling Modifiers & Double Negatives

Rule	Explanation (Hindi)	Incorrect ❌	Correct ✅
1. Dangling Modifier	The subject doing the action must be clearly mentioned.	Walking in the garden, a snake bit him. (यहाँ ऐसा लगता है कि साँप बगीचे में घूम रहा था)	Walking in the garden, he was bitten by a snake.
2. Double Negatives	Two negatives cancel each other out. Use only one.	I don’t have no money.	I don’t have any money. (या: I have no money)

📋 10-Minute Revision Chart (Exam Day Quick Glance)

Print this table or save it for your last-minute revision before the exam hall!

Error Type	Golden Rule	Example (Wrong → Right)
Subject-Verb	Along with/with + Singular Verb	Ram, with his friends, is (not are) going.
Subject-Verb	Either/Neither…or/nor + Nearest Noun	Either she or her sisters are (not is) coming.
Tense	‘Since’ takes Point of Time & Perf. Cont. Tense	I have been reading since 8 AM (not for 8 AM).
Tense	‘If’ clause never takes ‘Will/Shall’	If he comes (not will come), I will go.
Preposition	Agree to (idea) / Agree with (person)	I agree with you (not to you).
Article	No ‘the’ before plural general nouns	Honest men are respected (not The honest men).
Confusing	Affect (verb) vs Effect (noun)	The medicine affected me. It had a good effect.
Parallelism	Not only…but also (same form)	She is not only wise but also beautiful.
Countable	Scenery, Poetry, Furniture, News = Singular	The scenery is (not are) beautiful.
Double Neg.	Never use not + no/none/never	I haven’t seen anyone (not no one).

🎯 Pro-Tips for Solving Spotting Errors in Exams

Read the whole sentence carefully: Don’t just look at the underlined part. Sometimes the error is in the non-underlined portion (e.g., the subject is hidden at the end).
Check the “Verb” first: Whenever you see a sentence, locate the main verb immediately. Then look for its subject. 70% of errors are Subject-Verb mismatches.
Look for Time Markers: Words like yesterday, tomorrow, since, for, already, yet are huge red flags. They always indicate a tense error.
Eliminate the “Fluff”: Remove phrases between commas (like along with, together with, as well as) to clearly see the main subject and verb.
Trust your ear, but verify with rules: If it sounds wrong, it probably is. But don’t rely solely on instinct—always apply the grammatical rule mentally.

🧪 Test Yourself: Practice MCQs

Let’s put your skills to the test. Identify the error in these sentences:

Q1. Find the error:
Neither the captain nor the players (A) / was satisfied (B) / with the umpire’s decision. (C) / No error (D)

Answer: B (was satisfied) is the error.
Explanation: With Neither…nor, the verb agrees with the noun closest to it. The closest noun is “players” (plural), so the verb should be “were satisfied”.
Correct: Neither the captain nor the players were satisfied with the umpire’s decision.

Q2. Find the error:
The sceneries (A) / of Kashmir (B) / are very charming. (C) / No error (D)

Answer: A (The sceneries) is the error.
Explanation: Scenery is an uncountable noun (it has no plural form).
Correct: The scenery of Kashmir is very charming.

Q3. Find the error:
She has been working (A) / in this company (B) / for the last five years (C) / before she resigned. (D)

Answer: D (before she resigned) is the error, but wait—the tense issue is in A/C. Let me rephrase the MCQ to make it clean.
She has been working (A) / in this company (B) / since five years (C) / No error (D)
Answer: C (since five years) is the error.
Explanation: “Five years” is a duration. We use For + duration. “Since” is used with a point of time (e.g., since 2018).
Correct: …for five years.

Q4. Find the error:
The principal (A) / along with the teachers (B) / are going on an educational tour. (C) / No error (D)

Answer: C (are going) is the error.
Explanation: Along with is an additive phrase. It does not change the number of the subject. The main subject is “The principal” (Singular). The verb must be singular.
Correct: …is going on an educational tour.

Q5. Find the error:
He is not only famous (A) / in India but also (B) / in abroad. (C) / No error (D)

Answer: C (in abroad) is the error.
Explanation: We do not use a preposition (in, at, to) before the word “abroad”. “Abroad” is an adverb.
Correct: …but also abroad.

✅ Final Words

Mastering Error Correction is not about knowing 100% of grammar—it is about recognizing the top 20 recurring traps that examiners set year after year. Memorize the rules from this guide, practice previous year papers, and you will see your accuracy skyrocket.