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SAT Reading and Writing skill page

SAT Boundaries Between Clauses Practice

Check whether each side of the punctuation can stand alone as a complete clause.

Practice boundaries between clauses in Dolphin SATPractice questions
10-16 min practice time3 questions on pageStandard English Conventions
Practice time10-16 min
Practice questions3 questions
Best forStandard English Conventions

What this tests

What to know for this SAT skill

How do you choose a boundary between clauses?

First identify whether each group of words can stand alone. Then check the relationship between the ideas. Two complete clauses do not automatically require a semicolon: the punctuation must also preserve the meaning of the sentence.

When does a semicolon work?

A semicolon can join two closely related independent clauses without a coordinating conjunction. Read each side separately to check that it expresses a complete thought. A comma alone would create a comma splice; adding a coordinating conjunction can make a comma appropriate.

When can a colon join complete clauses?

A colon can follow a complete clause and introduce an explanation or elaboration. If the words after it also form a complete clause, that does not rule the colon out. Ask whether the second idea explains or develops the first, rather than treating every pair of independent clauses as the same punctuation problem.

Why must you reread the whole sentence?

A word such as because makes the following clause dependent and states a reason. That changes both the structure and the meaning. Check which event is being explained, and use the passage's context to judge the relationship. Do not reject a conjunction only because the original words on either side could stand alone.

Method reference: College Board SAT Practice Test 6 answer explanations, Reading and Writing Module 2, questions 22 and 25. Guidance reviewed .

Dolphin practice questions

Practice your skill

Question 1 of 3Easy
Which choice correctly joins the clauses? The data were incomplete ___ the team repeated the trial.
  1. ,
  2. ;
  3. because
  4. and because
Show answer and solution
Correct answerB. ;

Solution walkthrough

  1. Both sides are complete clauses, so a semicolon can join them.
Question 2 of 3Medium
Which sentence avoids a run-on?
  1. The battery failed the device shut down.
  2. The battery failed, the device shut down.
  3. The battery failed, so the device shut down.
  4. The battery, failed so the device shut down.
Show answer and solution
Correct answerC. The battery failed, so the device shut down.

Solution walkthrough

  1. A comma plus the coordinating conjunction so correctly joins the clauses.
Question 3 of 3Hard
Which choice best completes the sentence? The museum opened a new exhibit ___ visitors lined up around the block.
  1. ,
  2. ;
  3. which
  4. then
Show answer and solution
Correct answerB. ;

Solution walkthrough

  1. The two complete clauses are closely related and can be joined by a semicolon.
  2. A comma alone creates a comma splice, "then" alone runs the two clauses together, and "which" makes the sentence ungrammatical.

Avoid these traps

Common mistakes on this skill

Punctuating before identifying clause types

The correct boundary depends on whether each side is an independent clause, dependent clause, or phrase.

Joining two sentences with only a comma

A comma alone cannot join two independent clauses. A period, semicolon, or comma plus a coordinating conjunction can work; a colon can also work when the second clause explains or elaborates on the first.

Study plan

How to practice this skill in Dolphin

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  1. Find the subject and finite verb on each side of the proposed boundary.
  2. Decide which groups of words can stand as complete sentences.
  3. Apply the boundary rule and reread to ensure no fragment or run-on remains.
Practice boundaries between clauses in Dolphin SAT

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FAQ

Questions about SAT Boundaries Between Clauses Practice

What is an independent clause?

It contains a subject and predicate and expresses a complete thought that can stand as a sentence.

How can two independent clauses be joined?

Common options are a period, a semicolon, or a comma followed by a coordinating conjunction. A colon can also join them when the second clause explains or elaborates on the first. Check both clause structure and the relationship between the ideas.