The sentences 'We could go to the park, or we could ride our bikes.', 'Cindy folded the towels, and Mom put them away.', and 'I have to earn good grades, or I won’t graduate.' correctly use conjunctions to form compound sentences by using FANBOYS with proper commas.
To correctly use a conjunction to form a compound sentence, a coordinating conjunction should be used to join two main clauses. Each main clause contains a subject and predicate and can stand alone as a sentence. To form a compound sentence, you need a comma and one of the coordinating conjunctions (FANBOYS: for, and, nor, but, or, yet, so).
Looking at the provided options, the sentences that correctly use a conjunction to form a compound sentence are:
- We could go to the park, or we could ride our bikes.
- Cindy folded the towels, and Mom put them away.
- I have to earn good grades, or I won’t graduate.
Each of these sentences has two independent clauses joined either by the conjunction 'or' or 'and' with the correct placement of commas. These sentences demonstrate the use of coordinating conjunctions to create compound sentences, and so they are correct representations of compound sentences.