Grammar Fundamentals and Sentence Structure

TL;DR

Understanding sentence structure helps you build clear and effective communication. Sentences are built from subjects and predicates, conveying complete thoughts. Mastering these basics improves your writing and comprehension significantly.

1. The Mental Model

Think of a sentence like a simple machine. It has parts that work together to do one job: deliver a complete idea. If one part is missing or broken, the machine won't work right, and your message won't be clear.

2. The Core Material

You know that sentences are the building blocks of writing. To write well, you need to understand how these blocks fit together. Every complete sentence has two main parts: a subject and a predicate.

Subject: Who or What Is Doing the Action?

Photo by 정규송 Nui MALAMA on Pexels

The subject is the noun or pronoun that performs the action or is described in the sentence. It's the "who" or "what" the sentence is about.

• Simple Subject: This is just the main noun or pronoun.
  • The dog barks loudly. (Dog is the simple subject)
• Complete Subject: This includes the simple subject and all the words that modify it.
  • The big, fluffy dog barks loudly. (The big, fluffy dog is the complete subject)

Predicate: What Is the Subject Doing or Being?

Photo by Brett Jordan on Pexels

The predicate tells you what the subject is doing or what is being said about the subject. It always includes a verb.

• Simple Predicate: This is just the main verb (and any helping verbs).
  • The dog barks loudly. (Barks is the simple predicate)
• Complete Predicate: This includes the simple predicate and all the words that complete its meaning or modify it.
  • The dog barks loudly at the mail carrier. (Barks loudly at the mail carrier is the complete predicate)

Types of Sentences

Photo by Thirdman on Pexels

Sentences can be classified by their structure, which affects how they convey information.

Simple Sentence

A simple sentence has one independent clause. An independent clause contains a subject and a predicate and can stand alone as a complete thought.

• The cat slept.
• My friend and I went to the park.

Compound Sentence

A compound sentence has two or more independent clauses joined by a coordinating conjunction (for, and, nor, but, or, yet, so – remember FANBOYS), a semicolon, or a conjunctive adverb.

• The sun set, and the stars appeared.
• She studied hard; she passed the exam.

Complex Sentence

A complex sentence has one independent clause and at least one dependent clause. A dependent clause has a subject and a predicate but cannot stand alone as a complete thought because it starts with a subordinating conjunction (like because, although, while, if, when) or a relative pronoun (like who, which, that).

• Because it was raining, we stayed inside. (Dependent clause: Because it was raining; Independent clause: we stayed inside)
• I know the person who won the lottery. (Independent clause: I know the person; Dependent clause: who won the lottery)

Compound-Complex Sentence

This type has two or more independent clauses and at least one dependent clause.

• Although she was tired*, she finished her homework, and* then she went to bed. (Dependent: Although she was tired; Independent 1: she finished her homework; Independent 2: then she went to bed)

graph TD
    A["Sentence"] --> B["Subject"]
    A --> C["Predicate"]

    B --> D["Simple Subject (Noun/Pronoun)"]
    B --> E["Complete Subject (Simple Subject + Modifiers)"]

    C --> F["Simple Predicate (Verb)"]
    C --> G["Complete Predicate (Simple Predicate + Modifiers/Objects)"]

    H["Sentence Types"] --> I["Simple (1 Independent Clause)"]
    H --> J["Compound (2+ Independent Clauses)"]
    H --> K["Complex (1 Independent + 1+ Dependent Clause)"]
    H --> L["Compound-Complex (2+ Independent + 1+ Dependent Clause)"]

    J --> M["Coordinating Conjunctions ('FANBOYS')"]
    K --> N["Subordinating Conjunctions/Relative Pronouns"]

3. Worked Example

Let's break down a sentence to identify its core components and type:

"Even though the alarm clock didn't go off, I still managed to make it to my morning class on time, and I even had time for a quick breakfast."

1. Identify clauses:

   • "Even though the alarm clock didn't go off" - This is a dependent clause (starts with "Even though").
   • "I still managed to make it to my morning class on time" - This is an independent clause (can stand alone).
   • "I even had time for a quick breakfast" - This is another independent clause (can stand alone).

2. Identify subjects and predicates within each clause:

   • Dependent Clause:
     • Subject: "the alarm clock"
     • Predicate: "didn't go off"
   • Independent Clause 1:
     • Subject: "I"
     • Predicate: "still managed to make it to my morning class on time"
   • Independent Clause 2:
     • Subject: "I"
     • Predicate: "even had time for a quick breakfast"

3. Determine sentence type: Since we have one dependent clause and two independent clauses joined by "and", this is a compound-complex sentence.

4. Key Takeaways

• Every complete sentence needs a subject (who or what) and a predicate (what it's doing).
• A simple sentence has one independent clause and expresses a single, complete thought.
• Compound sentences link two or more independent clauses, often with a coordinating conjunction.
• Complex sentences combine an independent clause with one or more dependent clauses using subordinating conjunctions.
• Compound-complex sentences are the most elaborate, blending elements of both compound and complex structures.
• Understanding sentence structure helps you vary your writing and convey ideas precisely.

Common Mistakes to Avoid:
- Sentence fragments: Don't write incomplete sentences that lack a subject or a predicate, or are just a dependent clause standing alone.
- Run-on sentences: Don't join two or more independent clauses without proper punctuation or conjunctions.
- Confusing simple and complete subjects/predicates: Remember the "complete" versions include all modifiers.
- Misusing commas with conjunctions: Use a comma before coordinating conjunctions when they join two independent clauses.

5. Now Try It

Take a paragraph from an article, book, or even an email you recently wrote. Go through each sentence and identify its subject and predicate. Then, classify each sentence as simple, compound, complex, or compound-complex. Try to find at least one of each type.

What success looks like: You should be able to confidently point to the subject and predicate in any sentence, and correctly identify its structural type. This practice will make you more aware of your own sentence constructions.