Dependent clause

A dependent clause is a clause that provides an independent clause with additional information, but which cannot stand alone as a sentence. Dependent clauses either modify the independent clause of a sentence or serve as a component of it. Some grammarians use the term subordinate clause as a synonym for dependent clause. Others use subordinate clause to refer only to adverbial dependent clauses.

The different types of dependent clauses include noun clauses, relative (adjectival) clauses, and adverbial clauses.

Dependent words

In Indo-European languages, a dependent clause usually begins with a dependent word. One kind of dependent word is a subordinating conjunction. Subordinating conjunctions are used to begin dependent clauses known as adverbial clauses, which serve as adverbs. In the following examples, the adverbial clauses are bold and the subordinating conjunctions are italicized:

(The adverbial clause wherever she goes modifies the verb leaves.)
(The adverbial clause than I did modifies the adverb more.)

A subordinating conjunction can also introduce a noun clause:

(The noun clause that he likes me serves as the object of the main-clause verb know.)

Another type of dependent word is the relative pronoun. Relative pronouns begin dependent clauses known as relative clauses; these are adjective clauses, because they modify nouns. In the following example, the relative clause is bold and the relative pronoun is italicized:

(The adjective clause who does not have a beard describes the pronoun one.)

A relative adverb plays the role of an adverb in a relative clause, as in

(The relative clause why I came describes the noun reason, and within the relative clause the adverb why modifies the verb came.)
(The relative clause where he lives describes the noun place, and within the relative clause the adverb where modifies the verb lives.)

An interrogative word can serve as an adverb in a noun clause, as in

(The noun clause why you need experience functions as the direct object of the main-clause verb "understands", and within the noun clause why serves as an adverb modifying need.)

Noun clause

A noun clause can be used like a noun. It can be a subject, predicate nominative, direct object, appositive, indirect object, or object of the preposition. Some of the English words that introduce noun clauses are that, whether, who, why, whom, what, how, when, whoever, where, and whomever. Notice that some of these words also introduce adjective and adverbial clauses. A clause is a noun clause if a pronoun (he, she, it, or they) could be substituted for it. Follow these examples:


In English, in some instances the subordinator that can be omitted.

Example 1:

Example 2:

Relative (adjectival) clause

In Indo-European languages, a relative clause, also called an adjective clause or an adjectival clause, meets three requirements:

  1. Like all dependent clauses, it contains a verb (and also a subject unless it is a non-finite dependent clause). However, in a pro-drop language the subject may be a zero pronoun: the pronoun may not be explicitly included because its identity is conveyed by a verbal inflection.
  2. It begins with a relative adverb [when, where or why in English] or a relative pronoun [who, whom, whose, that or which in English]. However, the English relative pronoun may be omitted and only implied if it plays the role of the object of the verb or object of a preposition in a restrictive clause; for example, He is the boy I saw is equivalent to He is the boy whom I saw, and I saw the boy you are talking about is equivalent to the more formal I saw the boy about whom you are talking.
  3. The relative clause functions as an adjective, answering questions such as "what kind?", "how many?" or "which one?"

The adjective clause in English will follow one of these patterns:

This is the ball that I was bouncing.
That is the house where I grew up.
That is the house where I met her.
That is the person who hiccuped.
That is the person who saw me.
That is the person who(m) I was talking about.
That is the person who(m) I was telling you about.
That is the person about whom I was talking.
That is the person about whom I was telling you.
That is the dog whose big brown eyes pleaded for another cookie.
That is the dog whose big brown eyes begged me for another cookie.
That is the person whose car I saw.

For a discussion of adjective clauses in languages other than English, see Relative clause#Examples.


English punctuation

The punctuation of an adjective clause depends on whether it is essential or nonessential and uses commas accordingly. Essential clauses are not set off with commas; nonessential clauses are. An adjective clause is essential if the information it contains is necessary to the meaning of the sentence:

The word "vegetables" is non-specific. Accordingly, for the reader to know which are being mentioned, one must have the information provided in the adjective clause (in italics). Because it restricts the meaning of "vegetable", the adjective clause is called a restrictive clause. It is essential to the meaning of the main clause and uses no commas (and so does not experience a pause when spoken).

However, if the additional information does not help to identify more narrowly the identity of the noun antecedent but rather simply provides further information about it, the adjective clause is nonrestrictive and so requires commas (or a spoken pause) to separate it from the rest of the sentence:

Depending on context, a particular noun could be modified by either a restrictive or nonrestrictive adjective clause. For example, while "broccoli" is modified nonrestrictively in the preceding sentence, it is modified restrictively in the following.

Adverbial clause

Main article: Adverbial clause

"He saw Mary when he was in New York" and "They studied hard because they had a test" both contain adverbial clauses (in italics). Adverbial clauses express when, why, where, opposition, and conditions, and, as with all dependent clauses, they cannot stand alone. For example, When he was in New York is not a complete sentence; it needs to be completed by an independent clause, as in:

or equivalently

Dependent clauses and sentence structure

A complex sentence contains an independent clause and at least one dependent clause. A sentence with two or more independent clauses plus (one or more) dependent clauses is referred to as a compound-complex sentence. (Every clause contains a subject and predicate). Here are some English examples:

My sister cried because she scraped her knee. (complex sentence)

When they told me (that) I won the contest, I cried, but I didn't faint. (compound-complex sentence)

This sentence contains two dependent clauses: "When they told me", and "(that) I won the contest", the latter which serves as the object of the verb "told." The connecting word "that," if not explicitly included, is understood to implicitly precede "I won" and in either case functions as a subordinating conjunction. This sentence also includes two independent clauses, "I cried" and "I didn't faint," connected by the coordinating conjunction "but." The first dependent clause, together with its object (the second dependent clause), adverbially modifies the verbs of both main clauses.

Non-finite dependent clauses

Dependent clauses may be headed by an infinitive, gerund, or other non-finite verb form, which in linguistics is called deranked. For instance:

In these cases, the subject of the dependent clause may take a non-nominative form. An example is:

See also


    External links

    Look up dependent clause in Wiktionary, the free dictionary.
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