Clause and phrase are two important terms in English grammar. They are both parts of a sentence.

A clause is a group of words that consists of a subject and a verb.

Examples:

• He laughed.
• The guests arrived.

A phrase is a group of words that does not consist of a subject and a verb.

Examples: on a table, under the tree, near the wall, on the roof, at the door.

Both clauses and phrases may exist within a sentence. For instance:

Example.   

• He is sleeping in the bed.

• The first part of the sentence, “He is sleeping,” is a clause because it has a subject and a verb.
• The remaining part, “on the bed,” is a phrase because it lacks both a subject and a verb.

More Examples: Before discussing the conceptual difference between clause and phrase, read a few more examples (as follows) where red part is a clause, and the blue part is phrase.

• He is standing on the roof.
• The cat is sleeping under the table.
• She is drawing a map on the wall.
• He is waiting at the door.

A clause has a subject and a verb. It can stand alone as a complete sentence because it expresses a complete idea.

• Example: “He is sleeping” is a clause that can stand alone as a sentence.

A phrase cannot stand alone because it does not convey a complete idea.

• Example: “on the bed” is a phrase; it does not make sense on its own.
• Each word in a phrase has meaning, but the phrase collectively cannot form a complete thought.
• The purpose of a phrase is to complement the overall structure of a sentence.

This part is important because students often get confused between a clause and a phrase. Consider the following example:

• He was sitting on a table.

In this sentence, “He was sitting” is a clause, while “on a table” is a phrase. However, in some cases, the phrase may also be considered part of the clause. This is because a clause is defined as:

1. a group of related words, and
2. this group of related words must include a subject and a verb.

This means that all the related words (such as subject, verb, preposition, article, and object) can constitute a clause, with the subject and verb being compulsory. The requirement for a subject and a verb ensures that all other words linked to them can be identified, making the whole group a complete clause. For this reason, a clause is sometimes described as a combination of a subject and a predicate (all the words in a sentence other than the subject).

Students often get confused because, in initial lessons, a clause is usually reduced to its smallest form—just the subject and verb—so that learners can easily understand the concept. According to the full definition, however, a clause can include all words related to the subject and verb. This does not mean that phrases within the clause cease to be phrases. For example, in “He was sitting on a table”, if we view the entire sentence as a clause, the part “on a table” is still a phrase within that clause.

Clauses and Phrases in Compound Sentences:
Understanding this distinction is crucial because the main purpose of learning clauses is to identify groups of related words within a compound sentence as separate clauses. A compound sentence contains more than one clause, and each clause can include its own linked phrases.

Example:

• I waited for him at the library, but he was sitting in the classroom.

In this example, “at the library” and “in the classroom” are phrases linked to the first and second clauses, respectively.
When identifying clauses in a compound sentence, these phrases may also be viewed as part of the clause. This is important for two reasons:

1. By definition, a clause is a group of related words containing a subject and a verb.
2. In a compound sentence, one clause may depend on another to convey complete meaning.

Therefore, each clause in a compound sentence should be considered in its entirety—including all words linked to the subject and verb—to fully understand the sentence structure and how the different clauses interact with one another.

Simple Sentences and Multiple Clauses:

A simple sentence contains one clause. In other words, a clause can also be called a simple sentence.

• Example: “He laughed” is a sentence and also one clause.

Some sentences may have more than one clause. See the following examples.

• I waited for him, but he did not come. (two clauses).
• He bought a red shirt, but I bought a white shirt because it was cheaper. (three clauses)
• I like biology because I want to become a doctor, but my friend likes physics because he wants to become a doctor. (four clauses).