Understanding the nuances of sentence structure is fundamental to clear and effective communication. Two types of clauses that often cause confusion are relative clauses and subordinate clauses, though they are not mutually exclusive. In fact, relative clauses are a specific type of subordinate clause.
This distinction is crucial for both comprehending complex sentences and constructing them with precision. Grasping the relationship between these two grammatical concepts unlocks a deeper understanding of sentence construction and meaning.
This article will meticulously explore the differences and similarities between relative clauses and subordinate clauses, providing clear definitions, illustrative examples, and practical advice for their usage. We will delve into their roles within a sentence, how they function, and how to identify them, ensuring you can confidently differentiate and utilize them in your writing.
The Foundation: Understanding Clauses
Before dissecting relative and subordinate clauses, it’s essential to establish a solid understanding of what a clause is. A clause is a group of words containing a subject and a verb.
Clauses form the building blocks of sentences, and they can be categorized based on their ability to stand alone as a complete thought. This ability to stand alone is the primary differentiator between independent and dependent clauses.
Independent clauses, also known as main clauses, express a complete thought and can function as a simple sentence. Dependent clauses, on the other hand, do not express a complete thought and must be attached to an independent clause to make sense.
Subordinate Clauses: The Broader Category
A subordinate clause, also known as a dependent clause, is a group of words that contains a subject and a verb but cannot stand alone as a complete sentence. It relies on an independent clause to provide context and complete its meaning. Subordinate clauses are introduced by a subordinating conjunction or a relative pronoun.
These clauses add extra information to the main part of the sentence, elaborating on the subject, verb, or even another part of the independent clause. Without the main clause, a subordinate clause would feel incomplete and leave the reader hanging.
There are three main types of subordinate clauses: adverbial clauses, adjectival clauses (which include relative clauses), and noun clauses. Each type serves a distinct grammatical function within the sentence.
Adverbial Clauses
Adverbial clauses function like adverbs, modifying a verb, adjective, or another adverb in the independent clause. They answer questions like “when?”, “where?”, “why?”, “how?”, or “under what condition?”.
These clauses are typically introduced by subordinating conjunctions such as “because,” “although,” “since,” “if,” “when,” “while,” “where,” and “unless.” For instance, in the sentence “She left because she was tired,” the clause “because she was tired” tells us why she left.
The placement of adverbial clauses can vary; they can appear at the beginning or end of a sentence, often separated by a comma when they precede the independent clause. For example, “Although it was raining, we decided to go for a walk.”
Noun Clauses
Noun clauses function as nouns within a sentence. They can act as the subject, object, or complement of a verb. These clauses are often introduced by words like “that,” “what,” “who,” “whom,” “whose,” “which,” “whether,” or “if.”
Consider the sentence “I know what you mean.” Here, “what you mean” functions as the direct object of the verb “know.” It answers the question “What do I know?”.
Noun clauses can also be the subject of a sentence, as in “That he arrived late surprised everyone.” The entire clause “That he arrived late” acts as the subject of the verb “surprised.”
Adjectival Clauses (Relative Clauses)
Adjectival clauses, more commonly known as relative clauses, function like adjectives, modifying a noun or pronoun in the independent clause. They provide more information about that noun or pronoun, answering questions like “which one?” or “what kind?”.
Relative clauses are almost always introduced by relative pronouns such as “who,” “whom,” “whose,” “which,” and “that,” or by relative adverbs like “where,” “when,” and “why.” These relative pronouns or adverbs refer back to a noun or pronoun in the main clause, known as the antecedent.
For example, in the sentence “The book that I am reading is fascinating,” the relative clause “that I am reading” modifies the noun “book,” telling us which book is fascinating.
Relative Clauses: A Specific Type of Subordinate Clause
As established, relative clauses are a specific category within the broader group of subordinate clauses. Their defining characteristic is their function as an adjective, modifying a noun or pronoun. They are introduced by relative pronouns (who, whom, whose, which, that) or relative adverbs (where, when, why).
The relative pronoun or adverb in the clause connects it to the antecedent, which is the noun or pronoun it describes. This connection is vital for understanding who or what is being discussed.
Every relative clause is a subordinate clause, but not every subordinate clause is a relative clause. This hierarchical relationship is key to differentiating them.
Identifying Relative Clauses
The most straightforward way to identify a relative clause is to look for the presence of a relative pronoun or relative adverb that introduces a group of words containing a subject and a verb. This group of words will then modify a noun or pronoun elsewhere in the sentence.
Ask yourself: Does this clause describe a noun or pronoun? Does it start with a word like “who,” “which,” “that,” “whose,” “where,” “when,” or “why”? If the answer to both questions is yes, you’ve likely found a relative clause.
Consider the sentence: “The woman who lives next door is a doctor.” The clause “who lives next door” starts with the relative pronoun “who” and modifies the noun “woman.” It is a relative clause.
Restrictive vs. Non-restrictive Relative Clauses
A crucial distinction within relative clauses is between restrictive and non-restrictive clauses. This difference impacts the meaning of the sentence and the punctuation used.
Restrictive relative clauses are essential to the meaning of the sentence. They identify or specify the noun or pronoun they modify, limiting its meaning. If you remove a restrictive clause, the meaning of the sentence would change significantly or become unclear.
These clauses are not set off by commas. For example: “The car that is parked illegally will be towed.” The clause “that is parked illegally” is essential to identify which car will be towed; without it, we wouldn’t know.
Non-restrictive relative clauses, conversely, provide additional, non-essential information about the noun or pronoun they modify. The noun or pronoun is already clearly identified, and the clause simply adds extra detail. Removing a non-restrictive clause does not change the fundamental meaning of the sentence.
Non-restrictive clauses are always set off by commas. For instance: “My brother, who lives in London, is visiting next week.” The phrase “my brother” already identifies a specific person, so the clause “who lives in London” is extra information.
The use of “that” versus “which” is also tied to this distinction. “That” is generally used for restrictive clauses, while “which” is used for non-restrictive clauses (though “who” and “whom” can be used for both when referring to people).
The Relationship: Relative Clauses are Subordinate Clauses
It is vital to reiterate that relative clauses are a subtype of subordinate clauses. All relative clauses are subordinate because they contain a subject and verb but cannot stand alone as a complete sentence; they depend on an independent clause.
Their function as modifiers (adjectival) is what distinguishes them from other types of subordinate clauses like adverbial and noun clauses.
Think of it like this: “Subordinate Clause” is the general category, and “Relative Clause” is a specific item within that category, much like “Fruit” is a category and “Apple” is a specific type of fruit.
Key Differences Summarized
The primary difference lies in their function. Subordinate clauses encompass a broader range of functions, including acting as adverbs, nouns, and adjectives. Relative clauses specifically function as adjectives.
While all relative clauses are subordinate, not all subordinate clauses are relative. This is the core distinction to remember.
The introductory words also differ. Subordinate clauses can be introduced by subordinating conjunctions (for adverbial clauses) or by relative pronouns/adverbs (for relative clauses) and interrogative words (for noun clauses).
Practical Examples to Illustrate
Let’s examine several sentences to solidify our understanding. Pay close attention to the italicized clauses.
Sentence 1: “She sings beautifully because she practices every day.” Here, “because she practices every day” is a subordinate clause functioning as an adverb, explaining why she sings beautifully.
Sentence 2: “I believe that you can achieve your goals.” In this case, “that you can achieve your goals” is a subordinate noun clause acting as the direct object of the verb “believe.”
Sentence 3: “The dog that barked all night kept me awake.” The clause “that barked all night” is a subordinate relative clause modifying “dog,” specifying which dog caused the sleeplessness.
Sentence 4: “We visited the town where my parents grew up.” This sentence contains the subordinate relative clause “where my parents grew up,” which modifies “town” and tells us more about it.
Sentence 5: “Although it was late, he continued working.” This is an adverbial subordinate clause, introduced by “although,” indicating a condition contrary to the main clause’s action.
Sentence 6: “The book, which I borrowed from the library, was very informative.” Here, “which I borrowed from the library” is a non-restrictive relative clause, providing additional information about “the book.”
When to Use Which
The choice between different types of clauses depends entirely on the grammatical role you want them to play in your sentence. If you need to modify a noun or pronoun, you’ll use a relative clause.
If you need to explain why, when, where, or how something happened, an adverbial clause is appropriate. To use a clause as a subject, object, or complement, a noun clause is your tool.
Mastering these distinctions allows for greater flexibility and precision in your writing, enabling you to convey complex ideas with clarity.
Common Pitfalls and How to Avoid Them
One common error is using a relative pronoun to introduce a clause that doesn’t function as an adjective, or failing to identify a relative clause when it’s present. Another pitfall is incorrect punctuation, particularly with restrictive versus non-restrictive clauses.
Always check if the clause is essential for identifying the noun it modifies. If it is, it’s restrictive and needs no commas. If it’s extra information, it’s non-restrictive and requires commas.
Another mistake is treating a subordinate clause as a complete sentence. Remember, subordinate clauses are dependent and require an independent clause to form a grammatically correct sentence.
The Importance of Clear Sentence Structure
Well-constructed sentences are the bedrock of effective communication. Understanding the roles of different clause types, including the relationship between subordinate and relative clauses, empowers writers to build sentences that are both grammatically sound and easy to understand.
By meticulously analyzing sentence components and their functions, you can elevate your writing from functional to sophisticated. This leads to clearer expression of ideas and a more engaged reader.
The ability to accurately identify and utilize relative and subordinate clauses is a hallmark of strong writing, contributing significantly to the overall coherence and impact of your message.
Conclusion: Mastering the Hierarchy
In conclusion, subordinate clauses are a broad category of dependent clauses that cannot stand alone. Relative clauses are a specific type of subordinate clause that functions as an adjective, modifying nouns or pronouns.
They are introduced by relative pronouns or adverbs and are crucial for adding descriptive detail to sentences. Recognizing their hierarchical relationship—that all relative clauses are subordinate, but not all subordinate clauses are relative—is key to understanding their distinct roles.
By practicing identification and usage, and by paying close attention to punctuation, you can confidently employ these essential grammatical structures to enhance the clarity, precision, and sophistication of your written communication.