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SAT Reading and Writing skill page

SAT Punctuation Practice

Learn the punctuation rules that let you spot comma splices, clean sentence boundaries, and correct clause structure.

Practice punctuation in Dolphin Try examples
10-15 min practice time 3 examples on page Standard English Conventions
Practice time 10-15 min
On-page examples 3 examples
Best for Standard English Conventions

What this tests

What to know for this SAT skill

Practice examples

Try a few SAT-style questions

Example 1 Easy

Which choice correctly joins the two independent clauses?

  1. The experiment was difficult, the results were clear.
  2. The experiment was difficult; the results were clear.
  3. The experiment was difficult the results were clear.
  4. The experiment was difficult, and clear.
Show answer and explanation

Answer: The experiment was difficult; the results were clear.

A semicolon can join two closely related independent clauses. A comma alone would create a comma splice.

Example 2 Medium

Which sentence uses commas correctly?

  1. The novel which was published in 1925 remains popular.
  2. The novel, which was published in 1925, remains popular.
  3. The novel which was published, in 1925 remains popular.
  4. The novel, which was published in 1925 remains popular.
Show answer and explanation

Answer: The novel, which was published in 1925, remains popular.

The phrase "which was published in 1925" is nonessential, so it should be set off with commas on both sides.

Example 3 Hard

Which choice uses a colon correctly?

  1. The club needs: notebooks, markers, and tape.
  2. The club needs three supplies: notebooks, markers, and tape.
  3. The club needs three: supplies notebooks, markers, and tape.
  4. The club: needs three supplies, notebooks, markers, and tape.
Show answer and explanation

Answer: The club needs three supplies: notebooks, markers, and tape.

A colon should follow a complete sentence. "The club needs three supplies" is complete, so the colon can introduce the list.

Avoid these traps

Common mistakes on this skill

Using a comma between two complete sentences

A comma alone cannot join two independent clauses. Use a period, semicolon, or comma plus a coordinating conjunction.

Putting a colon after a fragment

The words before a colon must form a complete sentence.

Only using one comma for nonessential information

If nonessential information appears in the middle of a sentence, it usually needs commas on both sides.

Study plan

How to practice this skill in Dolphin

  1. First identify whether each side of the punctuation is a complete sentence.
  2. Use semicolons only when both sides can stand alone.
  3. Use colons after complete sentences to introduce lists or explanations.
  4. Check whether descriptive phrases are essential or nonessential.
Practice punctuation in Dolphin

Related practice

Build the surrounding skills

SAT Transitions PracticeSAT Command of Evidence PracticeSAT Words in Context PracticeSAT Reading and Writing skill hub

Skill cluster

Keep practicing SAT Reading and Writing

SAT Reading and Writing skill hub SAT Transitions PracticeSAT Command of Evidence PracticeSAT Words in Context PracticeSAT Subject-Verb Agreement PracticeSAT Sentence Boundaries PracticeSAT Rhetorical Synthesis PracticeSAT Central Ideas Practice SAT Math Practice Pages Dolphin SAT study guides SAT score guides by college

FAQ

Questions about SAT Punctuation Practice

What punctuation is most important for SAT Reading and Writing?

Commas, semicolons, colons, dashes, and periods are the highest-value marks to master.

How do I spot a comma splice?

Look for two complete sentences joined by only a comma. If both sides can stand alone, the comma is not enough.

Are punctuation questions rule-based?

Yes. Most SAT punctuation questions can be solved by checking sentence boundaries and clause structure.