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O-Level Paper 1 Editing: Common Error Types

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Of all the sections in O-Level English Paper 1, the Editing section is one you can definitely conquer. You are given a short passage and your task is to find and correct the errors. Success comes down to grammar and precision. The key is practice and familiarity. The more you know these error types, the faster you will spot them. Let’s get into it!

1. Tense Consistency

What it is

Every piece of writing has a dominant tense, whether past or present. Tense consistency errors happen when the writer shifts tense unexpectedly within a sentence or passage without good reason.

What to look for

Read the passage and establish what the dominant tense is. Then watch for any verbs that suddenly shift to a different tense without reason.

Example
Incorrect: She walked into the room and sits down quietly.
Correct: She walked into the room and sat down quietly.
The passage is written in the past tense so “sits” should be “sat”.

2. Subject-Verb Agreement

What it is

The verb in a sentence must agree with its subject. A singular subject takes a singular verb, and a plural subject takes a plural verb. This sounds simple, but it gets tricky when the subject and verb are separated by other words.

What to look for

Identify the true subject of the verb and check whether they match. Do not be distracted by nouns that appear between the subject and the verb.

Example
Incorrect: The group of students were excited about the trip.
Correct: The group of students was excited about the trip.
The subject is “the group” which is singular, not “students.”

3. Word Form

What it is

English words come in different forms: nouns, verbs, adjectives, and adverbs. A word form error happens when the wrong form of a word is used in a sentence.

What to look for

Ask yourself what role the word is playing in the sentence. If it is describing a noun, it should be an adjective. If it is modifying a verb, it should be an adverb. If it is naming something, it should be a noun.

Example
Incorrect: She had to quickly make a decide.
Correct: She had to quickly make a decision.
A noun (“decision”) is needed here because “a” must be followed by a noun instead of a verb (“decide”).

4. Pronoun

What it is

Pronouns are words that replace nouns, and there are several types that can be tested in the editing section. Personal pronouns refer to people or things (I, he, she, they, it). Relative pronouns connect clauses to nouns (who, whom, which, that). Reflexive pronouns refer back to the subject (himself, themselves, itself). Possessive pronouns indicate ownership (his, hers, theirs, whose). Indefinite pronouns refer to non-specific people or things (everyone, someone, each, neither).

What to look for

Check that the pronoun matches the noun it refers to and that the correct type of pronoun is used.

Example
Incorrect: The teacher which taught us retired.
Correct: The teacher who taught us retired.
“Who” is used to refer to people.

5. Connectors and Conjunctions

What it is

Connectors are words and phrases that link ideas, such as “however”, “therefore”, “although”, “because” and “despite”. Errors happen when the wrong connector is used, changing or confusing the logical relationship between ideas.

What to look for

Think about the relationship between the two ideas being connected. Are they contrasting? Cause and effect? Adding on to something? Make sure the connector reflects that relationship accurately.

Example
Incorrect: He studied hard. However, he passed the exam.
Correct: He studied hard. Therefore, he passed the exam.
“However” signals contrast, but passing after studying hard is something expected or a natural result. Hence, “therefore” is the correct connector because it signals the consequence.

6. Prepositions

What it is

Prepositions are words like “in”, “on”, “at”, “for”, “to”, “with” and “by”. They indicate relationships of time, place, and direction.

What to look for

Preposition errors can be subtle. The sentence may still sound somewhat natural with the wrong preposition, so train yourself to pause and check them deliberately.

Example
Incorrect: She has been waiting since two hours.
Correct: She has been waiting for two hours.
“Since” is used with a specific point in time (since 3pm, since Monday). “For” is used with a duration (for two hours, for a week).

7. Articles (A, An, The)

What it is

Articles are easy to overlook. “A” and “an” are indefinite articles used when referring to something non-specific. “The” is the definite article used when referring to something specific or previously mentioned. The most common article error is using the wrong article for a noun.

What to look for

Ask whether the noun being referred to is specific or general, and whether it has been mentioned before in the passage.

Example
Incorrect: She wants to become the doctor when she grows up.
Correct: She wants to become a doctor when she grows up.
She is not referring to a specific, known doctor, so the indefinite article “a” is correct.

8. Countable and Uncountable Nouns

What it is

Countable nouns can be counted individually (one book, two books). Uncountable nouns cannot (water, information, furniture). Errors happen when uncountable nouns are treated as countable, or when the wrong quantifier is used.

What to look for

Watch for uncountable nouns being pluralised incorrectly (they should always be singular), or paired with the wrong quantifier.

Example

Incorrect: She does not have many time to finish the project.
Correct: She does not have much time to finish the project.
“Time” is uncountable. “Many” cannot be used with it as it is only for countable nouns.

9. Comparatives and Superlatives

What it is

Comparatives compare two things (bigger, more interesting), while superlatives describe the extreme of a group (biggest, most interesting). Errors occur when the wrong form is used.

What to look for

Check whether two things or more than two things are being compared.

Example
Incorrect: This is the more difficult of all the questions I have encountered.
Correct: This is the most difficult of all the questions I have encountered.
When comparing across a group of more than two, the superlative form is required.

10. Spelling

What it is

Spelling errors are straightforward but easy to miss when you are reading quickly. The editing passage may contain commonly misspelled words, homophones used incorrectly, or words with tricky letter patterns.

What to look for

Read slowly and deliberately. Pay special attention to homophones, which are words that sound alike but have different meanings and spellings, such as “their” and “there”, “affect” and “effect”, and “principal” and “principle”.

Example
Incorrect: There dog ran happily across the park.
Correct: Their dog ran happily across the park.
“There” is used to indicate a location, “their” shows possession.

Ready to Master Editing and Beyond?

As a final tip, do not read through the passage once and expect to spot all the errors. A good habit is to read the passage through once to understand the overall context, then go back and work through it line by line. Errors in the editing section are often subtle so you need to be careful!

If you found this guide helpful, imagine what you could do with personalised guidance and consistent practice. At WRITERS AT WORK, we help secondary students tackle every section of O-Level English with confidence, from editing and comprehension to composition writing. We break down exactly what examiners are looking for and give you the tools to deliver it. Come and be part of a community of students who are serious about improving!

You can also follow us on TikTok and Facebook for more tips, practice questions, and writing advice.

Frequently Asked Questions (FAQs)

Q1. How many errors are there in the editing section?

Although there are ten blanks (lines 2–11), only eight contain errors. For lines with no error, students should place a tick (✓) in the blank.

Q2. Is the editing section easier than the other sections of Paper 1?

It is widely considered one of the more manageable sections because the errors follow predictable patterns and you can apply grammar rules. With enough practice, it becomes one of the most reliable sections to score well in.

Q3. How much time should I spend on the editing section in the exam?

Most students find that ten minutes is sufficient. Remember, you still have Situational and Continuous Writing to do. If you are stuck on a particular line, move on and come back to it. Do not let one tricky line eat into your time for the rest of the paper.

Jemmies Siew
Article Written By

Jemmies Siew

Jemmies Siew, Managing Director and Co-Founder of WRITERS AT WORK Enrichment Centre. With over 15 years of experience in education, entrepreneurship, and marketing, Jemmies has helped shape Singapore’s English enrichment landscape through her vision for transformative learning.

She is passionate about connecting real-world issues with language learning, helping students think critically and express themselves clearly. Connect with her on LinkedIn to follow her insights on education, content marketing, and thought leadership.

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