Commas for Clarity

A comma is often used after an introductory element at the beginning of a sentence. These elements can include introductory interjections, prepositional phrases, absolute phrases, adverbs, and transitional expressions.








https://www.englishgrammar101.com/module-12/punctuation-end-marks-and-commas/lesson-7/commas-with-introductory-elements

• ​Introductory Interjections

Yes, we should go soon.

• Introductory Prepositional Phrases (unless very short, 3 words or fewer)

  Between the towering city buildings, the sky could be seen.

• Introductory Absolute Phrases

  The rain finally over, we left the shelter of the trees and walked on.

• Introductory Adverbs (where, when, how, and how often)

  Quietly, we tiptoed past the bedroom door so that we wouldn't wake Dad.

• Introductory Transitions

  Next, we will analyze Shakespeare's play Twelfth Night.

https://www.englishgrammar101.com/module-12/punctuation-end-marks-and-commas/lesson-7/commas-with-introductory-elements