Quick Answer
A nonrestrictive clause is a descriptive element in the Digital SAT Reading and Writing section that provides non-essential information about a noun. These clauses, frequently tested in Standard English Conventions questions, appear in approximately 15-20% of grammar-based items and must be set off by symmetrical punctuation such as commas, dashes, or parentheses.
A nonrestrictive clause is a type of dependent clause that adds extra, non-essential information to a sentence without changing its primary identity. In grammar, these clauses are typically introduced by relative pronouns like 'which' or 'who' and must be enclosed by a pair of punctuation marks ($Punctuation + Clause + Punctuation$).
Question: The Great Barrier Reef [,] which is the world's largest coral reef system [,] faces significant threats from climate change. Options: A) system faces, B) system, faces, C) system; faces, D) system—faces. Solution: B is correct. The phrase 'which is the world's largest coral reef system' is a nonrestrictive clause because it adds extra detail but isn't necessary for the sentence's identity. It must be enclosed by matching punctuation (commas).
Asymmetrical Punctuation: Students often start a nonrestrictive clause with a comma but end it with a dash, or vice-versa, failing to maintain consistency.
Misidentifying Essential Info: Students may place commas around a restrictive clause that is actually necessary to identify the noun, thereby changing the sentence's meaning.
Confusing 'That' and 'Which': Students often forget that 'which' usually introduces nonrestrictive clauses requiring commas, while 'that' introduces restrictive clauses which should have no commas.
Students targeting 750+ should know that the SAT occasionally uses em-dashes or parentheses instead of commas to set off nonrestrictive clauses, but the rule of symmetry remains absolute: you cannot mix a comma with a dash to bound the same clause.
Appositive
An appositive is a noun or noun phrase that renames another noun right beside it. On the Digital SAT, these frequently appear in the Standard English Conventions questions of the Reading and Writing section. Mastery of appositives is essential, as they typically appear in approximately 10-15% of punctuation-based questions.
Dependent Clause
A **dependent clause** is a group of words containing a subject and verb that cannot stand alone as a sentence. On the Digital SAT, these frequently appear in the Reading and Writing section, particularly within 'Standard English Conventions' questions where students must correctly punctuate the relationship between clauses to avoid fragments.
Em Dash
The em dash is a versatile punctuation mark on the Digital SAT used primarily to set off nonessential information or provide emphasis. Frequently appearing in the Reading and Writing section under Standard English Conventions, it functions similarly to commas or parentheses when used in pairs to isolate parenthetical phrases.
Relative Pronoun
A relative pronoun is a word used to connect a dependent clause to an independent clause. On the Digital SAT, these appear frequently in the Reading and Writing section, particularly within Standard English Conventions questions. Mastery of terms like who, which, and that is essential for correcting sentence structure and punctuation errors.
Restrictive Clause
A restrictive clause is an essential grammatical unit that limits or identifies the noun it modifies. On the Digital SAT, these clauses appear frequently within the Standard English Conventions questions. Unlike nonrestrictive clauses, they are never set off by commas, a distinction typically tested in approximately 2 to 4 questions per exam.
A nonrestrictive clause on the SAT is a group of words that provides supplementary information about a noun but is not essential to the sentence's core meaning. Tested in the Reading and Writing section, these clauses are always set off by punctuation like commas or dashes. If the clause were removed, the sentence would still make sense and the noun would remain clearly identified.
To identify a nonrestrictive clause, try removing the clause from the sentence. If the sentence still makes sense and the noun it modifies is still specific and identifiable, the clause is nonrestrictive. On the SAT, these clauses often begin with 'which' or 'who' and require surrounding punctuation, such as a pair of commas, to separate the extra info from the main idea.
The main difference is that a nonrestrictive clause adds 'bonus' information, while a restrictive clause provides 'essential' information needed to identify the noun. In terms of punctuation, nonrestrictive clauses require commas, dashes, or parentheses. Restrictive clauses, which often begin with 'that,' should never be set off by commas because they are vital to the sentence's grammatical and logical structure.
You will typically encounter approximately 2 to 4 questions involving nonrestrictive clauses on a standard Digital SAT Reading and Writing section. These are usually found in the Standard English Conventions portion of the test. Mastering this concept is crucial for scoring well on punctuation and sentence structure questions, as they appear consistently across both modules of the exam.
