Question

identify the sentence with correct comma usage.
the report, was thorough well-researched and convincing.
after dinner, we went to the theater, and then to a coffee shop.
the student asked, if she could resubmit her essay.
the professor who teaches calculus, is retiring next year.

Explanation:

• Analyze each option:
• Orange: "The report, was thorough..." has an unnecessary comma (splits subject and verb).
• Green: "The student asked, if..." incorrectly uses a comma before a subordinate clause (no comma needed here).
• Red: "The professor who teaches calculus, is..." has an unnecessary comma (the relative clause "who teaches calculus" is essential, no comma should separate it from the main clause).
• Blue: "After dinner, we went... theater, and then..." uses commas correctly: to set off an introductory phrase ("After dinner") and to separate independent clauses in a compound sentence ("we went to the theater, and then to a coffee shop").

Answer:

Blue box: After dinner, we went to the theater, and then to a coffee shop.