Here's why:
* Clarity: Introductory phrases often set the stage for the main clause of the sentence. A comma acts as a signal to the reader that the introductory phrase is complete and the main clause is about to begin. This helps the reader understand the sentence's flow and avoid misinterpreting the meaning.
* Avoiding Misreading: Without a comma, a reader might initially interpret the introductory phrase as part of the main clause, potentially leading to a misunderstanding of the sentence's intended meaning.
Example:
* Without a comma: "After the long hike, we were exhausted and ready for a good meal." This could be read as "After the long hike we were exhausted..." leading to confusion.
* With a comma: "After the long hike, we were exhausted and ready for a good meal." The comma clearly separates the introductory phrase from the main clause, making the sentence's meaning unambiguous.
Key Takeaway: Using a comma after introductory phrases enhances the clarity and readability of your writing, ensuring that your message is understood as intended.