12 Common O-Level Editing Error Types Students Should Know
O-Level English Editing tests more than whether a sentence simply “sounds right”. Students need to recognise the grammar relationship being tested, identify the incorrect word and replace it accurately.
One reason students find Editing difficult is that there is no single error type to look for. A passage may test verbs in one line, nouns in another and a connector or preposition later in the passage.
Learning the common error categories gives students a more systematic way to check their work. Instead of searching randomly for something that looks unusual, they can ask specific grammar questions as they move through the passage.
This guide covers 12 common O-Level Editing error types, together with examples and explanations of how each error works.
12 Common O-Level Editing Errors at a Glance
Error Type | What to Check | Example |
|---|---|---|
Subject-verb agreement | Does the verb agree with the subject? | Each student have → has |
Tense | Does the verb match the time context? | stands → stood |
Infinitive / gerund | Is the correct verb form used? | enjoyed to work → working |
Active / passive voice | Is the subject doing or receiving the action? | replaced → was replaced |
Singular / plural nouns | Does the noun match its quantity word? | several strategy → strategies |
Articles / determiners | Does a singular countable noun need a determiner? | visited museum → a museum |
Word forms | Is a noun, verb, adjective or adverb required? | confident → confidence |
Pronouns | Does the pronoun agree with its noun? | they → it |
Prepositions | Is the correct fixed preposition used? | concerned on → about |
Connectors | Does the connector express the correct relationship? | because → so that |
Modal verbs | Is the base verb used after the modal? | should to review → should review |
Relative pronouns | Does the relative pronoun suit the noun? | which → who |
The list is useful as a quick checking guide, but students also need to understand why each correction is required.
1. Subject-Verb Agreement
A verb must agree with its subject in number.
Incorrect: One of the students have volunteered to lead the project.
Correct: One of the students has volunteered to lead the project.
Explanation: The subject is “one”, not “students”. Since “one” is singular, the singular verb “has” is required.
Students should identify the actual subject rather than automatically matching the verb with the nearest noun.
Another example:
The teacher, together with several student leaders, are organising the event.
The main subject is “teacher”. The correct sentence is:
The teacher, together with several student leaders, is organising the event.
2. Tense Errors
Verb tense should match the time and context of the passage.
Incorrect: When the performance ended, the audience stands and applauded loudly.
Correct: When the performance ended, the audience stood and applauded loudly.
Explanation: The actions all occurred in the past, so “stood” should agree with “ended” and “applauded”.
Students should look for time markers such as:
- yesterday;
- last week;
- every morning;
- since;
- by the time;
- currently; and
- next year.
3. Infinitive and Gerund Errors
Certain verbs are followed by particular verb forms.
Incorrect: The students enjoyed to work together on the mural.
Correct: The students enjoyed working together on the mural.
Explanation: The verb “enjoy” is followed by a gerund.
Other useful patterns include:
- decide to do;
- avoid doing;
- suggest doing;
- hope to do;
- prevent someone from doing; and
- look forward to doing.
4. Active and Passive Voice
Students must determine whether the subject performs or receives the action.
Incorrect: The damaged equipment replaced the following morning.
Correct: The damaged equipment was replaced the following morning.
Explanation: The equipment receives the action. A passive construction is needed: form of “be” + past participle.
5. Singular and Plural Nouns
Countable nouns must agree with their quantity words.
Incorrect: The workshop taught students several useful strategy.
Correct: The workshop taught students several useful strategies.
Explanation: “Several” must be followed by a plural countable noun.
Other useful combinations include:
- each participant;
- many reasons;
- several suggestions;
- much information;
- a piece of advice; and
- fewer mistakes.
6. Articles and Determiners
A singular countable noun usually requires an article or another determiner.
Incorrect: Our class visited museum near the city centre.
Correct: Our class visited a museum near the city centre.
Explanation: “Museum” is a singular countable noun and requires a determiner.
Students should distinguish among:
- a/an for one non-specific item;
- the for a particular or previously identified item; and
- no article when a plural or uncountable noun is used generally.
7. Word-Form Errors
A sentence may contain the correct root word but the wrong part of speech.
Incorrect: The speaker delivered her message with great confident.
Correct: The speaker delivered her message with great confidence.
Explanation: The sentence requires a noun after “with great”.
Students can strengthen their understanding by learning word families:
- confidence (noun), confident (adjective), confidently (adverb)
- success (noun), succeed (verb), successful (adjective), successfully (adverb)
- decision (noun), decide (verb), decisive (adjective), decisively (adverb)
- strength (noun), strengthen (verb), strong (adjective), strongly (adverb)
8. Pronoun Errors
Pronouns must agree with the nouns they replace.
Incorrect: The school introduced a new recycling programme, but they was not explained clearly.
Correct: The school introduced a new recycling programme, but it was not explained clearly.
Explanation: The pronoun refers to the singular noun phrase “a new recycling programme”, so “it” is required.
9. Preposition Errors
The wrong preposition may make a sentence grammatically inaccurate.
Incorrect: Many teenagers are concerned on excessive screen time.
Correct: Many teenagers are concerned about excessive screen time.
Explanation: The standard expression is “concerned about” when referring to worry about an issue.
Students can improve in this area by learning common expressions as complete phrases, such as:
- interested in;
- responsible for;
- participate in;
- contribute to;
- depend on; and
- familiar with.
10. Connector Errors
Connectors must accurately represent the relationship between clauses.
Incorrect: The organisers added more recycling points because residents could dispose of their unwanted electronics more conveniently.
Correct: The organisers added more recycling points so that residents could dispose of their unwanted electronics more conveniently.
Explanation: The second clause states the purpose of adding the recycling points.
Students should understand the different relationships expressed by common connectors:
- because introduces a reason;
- therefore introduces a result;
- although introduces a contrast;
- so that introduces a purpose; and
- unless introduces a negative condition.
11. Modal Verb Errors
Modal verbs are followed by the base form of the main verb.
Incorrect: Students should to review their corrections regularly.
Correct: Students should review their corrections regularly.
Explanation: After modal verbs such as “should”, “could”, “may”, “might” and “must”, use the base form without “to”.
12. Relative Pronoun Errors
Relative pronouns must suit the noun being described.
Incorrect: The volunteer which organised the event received an award.
Correct: The volunteer who organised the event received an award.
Explanation: “Who” is used for a person, while “which” is generally used for a thing.
How Should Students Use These 12 Error Types?
Students should not simply memorise the names of the categories.
When checking an Editing passage, ask questions such as:
- What is the subject of this verb?
- What time frame has the passage established?
- Does this quantity word require a singular or plural noun?
- Does the sentence require a noun, adjective or adverb?
- What noun does this pronoun refer to?
- Does this connector show cause, contrast, result or purpose?
The aim is to turn each grammar category into a checking question.
The more familiar students become with these patterns, the easier it becomes to recognise where a sentence may contain an error.
Create Your Own Editing Error Log
Students should also record which of the 12 categories they personally miss most often.
For example:
- Each student have → has — Subject-verb agreement: “Each student” is singular.
- Worked careful → carefully — Word form: an adverb describes “worked”.
- Many equipment → Much equipment — Countability: “equipment” is uncountable.
- Interested on → Interested in — Preposition: the fixed expression is “interested in”.
Over time, students may discover that they repeatedly lose marks in only two or three categories.
That allows revision to become much more targeted.
Master Common O-Level Editing Errors with Practice
O-Level English Editing becomes more manageable when students use a consistent method instead of checking words at random. By recognising common error patterns, understanding the grammar behind each correction and reviewing answers systematically, students can improve both accuracy and confidence.
Continue learning with our guides on Common Mistakes Students Make In Editing.
Want more structured practice and feedback? Explore Zespa Learning’s Secondary and O-Level English programme and book a trial class.
