Final answer:
In English, commas are used to separate clauses and set off nonessential information in sentences. Incorrect placement of a comma can lead to confusion. Two example sentences show how commas should be used after introductory clauses and to avoid disrupting the flow of essential information.
Step-by-step explanation:
The subject of your question pertains to the proper use of commas in English sentences. In the sentences provided, the commas are used to set off introductory elements, separate independent clauses, and set off nonessential information. An incorrect placement of a comma can lead to confusion and disrupt the flow of a sentence.
Examples with Correct Comma Usage
1. After she'd been for a long run, Lulu had a shower
2. The car that Leon bought from a friend was old and rusty.
Here, the comma after the introductory clause 'After she'd been for a long run' clarifies when Lulu took a shower. There is no need for a comma in the second sentence since the information is essential to the meaning of the sentence.
Here's how commas are used correctly in review questions:
- I finally found my keys, and I got to work just in time.
- Mrs. Contreras threw out her old coffee table and cleaned the carpet.
- Taking the elevator to the roof, we hoped we could see the skyline and the bay.
- Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy.
- I let my neighbor borrow my phone because she said hers was tapped by the police.