1. Lesson Overview

In this lesson, you will examine common sentence structure errors that frequently appear in English writing.

Even when learners understand grammar rules, problems often occur when clauses and phrases are combined incorrectly. These errors usually involve:

• sentence fragments

• run-on sentences

• comma splices

• faulty coordination

• faulty subordination

Understanding these errors helps learners identify problems in their writing and correct them effectively.

By the end of this lesson, you will be able to:

• recognise sentence fragments

• identify run-on sentences and comma splices

• detect incorrect coordination or subordination

• apply strategies to correct sentence structure errors

2. Concept Introduction

Consider the following example:

Incorrect:

Because the experiment failed.

This is a sentence fragment because it contains a dependent clause without an independent clause.

Correct:

The experiment was repeated because it failed.

Now examine another example:

Incorrect:

The experiment succeeded the results were published.

Correct:

The experiment succeeded, and the results were published.

Understanding how sentences are constructed helps writers avoid these structural errors.

3. Core Explanation

Sentence structure errors often occur when clauses are not combined correctly.

The most common problems include:

Sentence Fragments

A sentence fragment is an incomplete sentence that lacks either:

• a subject

• a verb

• or a complete thought

Example:

Because the data were inaccurate.

Run-on Sentences

A run-on sentence occurs when two independent clauses are joined without proper punctuation or conjunctions.

Example:

The experiment succeeded the results were published.

Comma Splices

A comma splice occurs when two independent clauses are joined only with a comma.

Example:

The experiment succeeded, the results were published.

Faulty Coordination

Faulty coordination occurs when clauses are joined incorrectly with coordinating conjunctions.

Faulty Subordination

Faulty subordination occurs when dependent clauses are not properly connected to independent clauses.

4. Rule Table

Common Sentence Structure Errors

5. Usage

Understanding sentence structure errors helps writers revise their sentences.

1. Correcting fragments

Incorrect:

After the experiment ended.

Correct:

The researchers analysed the results after the experiment ended.

2. Correcting run-on sentences

Incorrect:

The equipment malfunctioned the experiment failed.

Correct:

The equipment malfunctioned, so the experiment failed.

3. Correcting comma splices

Incorrect:

The test was successful, the report was published.

Correct:

The test was successful; the report was published.

4. Correcting faulty coordination

Incorrect:

The experiment succeeded but because the equipment worked properly.

Correct:

The experiment succeeded because the equipment worked properly.

5. Correcting faulty subordination

Incorrect:

Although the results were clear.

Correct:

Although the results were clear, additional testing was required.

6. Signal Words

Certain words often appear when clauses are connected correctly.

These connectors help show relationships between clauses.

7. Special Cases

Using Semicolons

A semicolon can connect closely related independent clauses.

Example:

The experiment succeeded; the results were published.

Breaking Long Sentences

Long sentences should sometimes be divided to improve clarity.

Example:

Long sentence:

The experiment succeeded because the equipment functioned properly and the researchers followed the procedure carefully while the system was monitored continuously.

Clearer version:

The experiment succeeded because the equipment functioned properly. The researchers also followed the procedure carefully.

8. Additional Notes

Recognising sentence structure errors improves clarity, coherence, and readability.

Strong writing depends on:

• clear sentence boundaries

• logical connections between clauses

• correct punctuation

Example:

Incorrect:

The experiment failed the equipment malfunctioned because the system overheated.

Correct:

The experiment failed because the equipment malfunctioned when the system overheated.

9. Common Errors

⚠ Sentence fragment

Incorrect:
Because the equipment malfunctioned.

Correct:
The experiment failed because the equipment malfunctioned.

Explanation:
Dependent clauses cannot stand alone.

⚠ Run-on sentence

Incorrect:
The experiment succeeded the results were published.

Correct:
The experiment succeeded, and the results were published.

Explanation:
Independent clauses must be connected properly.

⚠ Comma splice

Incorrect:
The equipment failed, the experiment stopped.

Correct:
The equipment failed, so the experiment stopped.

Explanation:
Comma splices require a conjunction or semicolon.

⚠ Faulty coordination

Incorrect:
The experiment succeeded and because the equipment worked properly.

Correct:
The experiment succeeded because the equipment worked properly.

Explanation:
Avoid mixing coordination and subordination incorrectly.

⚠ Incomplete subordinate clause

Incorrect:
Although the results were promising.

Correct:
Although the results were promising, further testing was required.

Explanation:
Dependent clauses must connect to independent clauses.

10. Lesson Mastery

After completing this lesson, you should now be able to:

✅ recognise sentence fragments
✅ identify run-on sentences and comma splices
✅ detect faulty coordination and subordination
✅ apply strategies to correct sentence structure errors