Option b is the correct sentence without any punctuation errors. Learning the rules of comma and semicolon usage can help avoid common mistakes like run-on sentences and comma splices. Correct punctuation ensures clarity and coherence in writing.
The correct sentence that does not contain any punctuation errors is option b. In this case, a comma before the coordinating conjunction 'but' properly joins the two independent clauses. Let's review punctuation for the additional example sentences:
- I finally found my keys, and I got to work just in time. (Two independent clauses should be joined by a comma and a coordinating conjunction.)
- Mrs. Contreras threw out her old coffee table and cleaned the carpet. (No comma is needed here because 'and' is joining two verbs that share the same subject.)
- Taking the elevator to the roof, we hoped we could see the skyline and the bay. (The introductory phrase requires a comma after it; no comma is needed before the 'and' as it joins items in a series.)
- Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy. (A comma is required after the introductory clause, and no comma is required before the 'and' joining the last items in a series.)
- I let my neighbor borrow my phone because she said hers was tapped by the police. (No comma is necessary because the reason expressed by 'because' is essential to the meaning of the sentence.)
Understanding the proper use of commas and semicolons is key to avoiding run-on sentences and comma splices. In example sentences with semicolons:
- Road construction in Seattle has hindered travel around town; streets have become covered with bulldozers, trucks, and cones. (A semicolon can be used between two closely related independent clauses.)
- It rained heavily during the afternoon; however, we still managed to have a picnic. (A semicolon followed by a conjunctive adverb and a comma is correct when joining two independent clauses that are related.)