What is a simple sentence?

Let’s start with the most basic unit of meaning: the simple sentence. In this lesson, we’ll break down a simple sentence into its parts, and we’ll learn to use these grammar terms to help us understand sentence structure:

Key terms:

First, we’ll break down a simple sentence into its two basic parts: 1) a subject and 2) a predicate.

• The subject is what the sentence is about. The subject is a noun: a person, place, thing, or idea.
• The predicate is what the subject does to something, what the subject is, what the subject has, or what happens to the subject. The predicate is a verb plus what the verb controls after it.

The following are the most basic and most common sentence structures. They all start with a subject that’s followed by a predicate. The predicate is a verb plus an object, complement, adverb, or preposition phrase.

1.1A Subject – Verb – Object

This is the fundamental sentence structure: a subject does something to an object.

Both subjects and objects are nouns. A noun is a person, place, thing, or idea.

1.1B Subject – Verb – Complement

In this case, the “be” verb means “=”. In other words, the complement “completes” the subject, or is equivalent to the subject.

1.1C Subject – Verb – Adverb

The adverb is formed by adding the suffix “ly” to an adjective:

• silent = adjective
• silently = adverb
• Sometimes the adverb goes before the verb and sometimes it goes after the verb.

1.1D Subject – Verb – Preposition phrase

Prepositions are the little words that indicate where or when something happens.

• Pre = before
• Position = place

Literally, it is a word that goes before a place in space or in time.

Clause: Together, a subject and predicate combination is called a clause.

• Clause = subject + predicate

Independent clause: If a clause makes sense on its own, if it’s a complete idea, it’s called an “independent clause.”

• Independent = by itself
• Simple sentence = Independent clause

In summary, a simple sentence is an independent clause, which means a Subject + Predicate (verb + object, verb + complement, verb + adverb, or verb + preposition phrase) that makes sense on its own. If your sentence doesn’t have one of these Subject + Predicate combos, then you don’t have a sentence.

Quiz: Review your understanding of simple sentences