W1A. Effective Sentence Structure

Author

Georgy Gelvanovsky

Published

September 17, 2025

Quiz | Flashcards

1. Summary

1.1 What is a Sentence?

A sentence is a fundamental unit of language that expresses a complete thought. To be considered a sentence, a group of words must satisfy four basic grammatical rules:

  1. It must contain a complete idea.
  2. It must have a specific grammatical structure, centered around a subject and a verb.
  3. It must begin with a capital letter.
  4. It must end with a punctuation mark (such as a period, question mark, or exclamation point).
1.2 The Clause

The core of every sentence is a clause. A clause is a group of words that contains both a subject (who or what performs the action) and a verb (the action or state of being). The simple formula is:

Subject + Verb = Clause

If a group of words lacks a subject, a verb, or both, it is not a clause. It is called a sentence fragment. A fragment cannot stand on its own because it does not express a complete thought.

  • Example of a fragment: “In the building at night.” (This has no subject or verb).
  • Example of a fragment: “Have learned a lot today.” (This has a verb phrase but is missing a subject).
1.3 Clause Types

Clauses are divided into two main categories: independent and dependent. The combination of these clause types determines the structure of a sentence.

1.3.1 Independent Clause

An independent clause (or main clause) contains a subject and a verb and expresses a complete thought. It is grammatically complete and can stand alone as its own sentence.

  • Example: “I like pizza.”
  • Example: “He has read a lot of books.”
1.3.2 Dependent Clause

A dependent clause (or subordinate clause) also contains a subject and a verb, but it does not express a complete thought. It cannot stand alone as a sentence. It begins with a subordinating conjunction (e.g., because, although, when, if) which makes the clause reliant on an independent clause to complete its meaning.

  • Example: “Although I like pizza…” (The thought is incomplete).
  • Example: “…because he has read a lot of books.” (This explains a reason but doesn’t state the main idea).
1.4 Sentence Types

There are four main types of sentences in English, categorized by the number and type of clauses they contain.

1.4.1 Simple Sentence

A simple sentence consists of exactly one independent clause. It has a single subject and verb combination and expresses a single complete thought.

  • Example: “A woman went to the gym.”
  • Example: “The black rabbit died yesterday.”
1.4.2 Compound Sentence

A compound sentence consists of two or more independent clauses joined together. These clauses are typically linked by a coordinating conjunction. The most common coordinating conjunctions can be remembered with the acronym FANBOYS:

  • For
  • And
  • Nor
  • But
  • Or
  • Yet
  • So

Punctuation Rule: When joining two independent clauses with a coordinating conjunction, a comma must be placed before the conjunction.

Independent Clause 1 + , + Coordinating Conjunction + Independent Clause 2

  • Example: “A woman went to the gym, and everybody liked her immediately.”
  • Example: “The black rabbit died yesterday, so we have bought a white elephant today.”
1.4.3 Complex Sentence

A complex sentence contains one independent clause and at least one dependent clause. The dependent clause is linked to the independent clause by a subordinating conjunction (e.g., because, since, although, while, when).

Punctuation Rules: The punctuation of a complex sentence depends on the order of the clauses.

  1. No Comma: If the independent clause comes first, followed by the dependent clause, no comma is needed. Independent Clause + Subordinating Conjunction + Dependent Clause
    • Example: “The woman went to the gym because she wanted to get fit.”
  2. Use a Comma: If the dependent clause comes first, it must be followed by a comma before the independent clause. Subordinating Conjunction + Dependent Clause + , + Independent Clause
    • Example: “Because she wanted to get fit, the woman went to the gym.”
1.4.4 Compound-Complex Sentence

A compound-complex sentence is the most intricate structure. It combines elements of both compound and complex sentences. It must contain at least two independent clauses and at least one dependent clause.

  • Example: “Although he organized his sources by theme, Mongo decided to arrange them chronologically, and he carefully followed the MEAL plan for organization.”
    • Dependent Clause: “Although he organized his sources by theme”
    • Independent Clause 1: “Mongo decided to arrange them chronologically”
    • Independent Clause 2: “he carefully followed the MEAL plan for organization”

Warning: Use compound-complex sentences carefully. While powerful, they can make your writing less readable if overused or constructed poorly.