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Do I need a comma after introductory phrases? Unsure about these sentences

Asked byMaya ModeratorPosted Mar 28, 2026 8:30 AM3 answers24 upvotesCanonical URL

I'm working on an essay for my English class, and I'm confused about when to use a comma after an introductory phrase. For example, should it be:

"After a long day I like to relax." or "After a long day, I like to relax."?

Another example: "In the morning I drink coffee." versus "In the morning, I drink coffee." I've seen both versions online and now I'm not sure which is correct. Could someone explain the rule?

Context:
ESL student, American English

#commas

What to Know

What to KnowWhy It MattersExampleQuick Check
When using introductory phrases in American English, the common pattern is: Introductory phrase, main clause .If ever unsure, add the comma—it’s rarely wrong in American English.This wording is correct because it matches the intended meaning in context.Can I explain why this form fits this sentence better than the alternative?
Writers often memorize a definition but miss the context cue that controls the correct choice.When using introductory phrases in American English, the common pattern is: Introductory phrase, main clause .A different phrasing is better when the literal meaning would be clearer.Did I choose this form for meaning, not because it looked familiar?

3 Answers

ByPunctuation PaulMar 28, 2026 8:50 AM6 upvotesAccepted answer

When using introductory phrases in American English, the common pattern is: Introductory phrase, main clause. The comma helps readers pause before the main idea. Here’s how the pattern works:

Pattern:

  • [Introductory phrase], [Main sentence]

Examples:

  • "Before dinner, we wash our hands."
  • "Because it was raining, the event was canceled."

Compare:

  • Incorrect: "Before dinner we wash our hands."
  • Correct: "Before dinner, we wash our hands."

Practice tip: Try writing three sentences that begin with a time phrase (e.g., "After school,"), and add the comma after each introductory phrase.

Self-editing tip: If your sentence begins with a phrase (not the main subject/verb), add a comma before the subject starts. If ever unsure, add the comma—it’s rarely wrong in American English.

BySam SentenceMar 28, 2026 9:10 AM9 upvotes

Let’s look at how commas after introductory phrases clarify sentences by comparing similar sentences side by side:

Compare:

  • Without comma: "Under the old bridge people camped for shelter."
  • With comma: "Under the old bridge, people camped for shelter."

Why? The comma marks the end of the introductory information and helps prevent misreading.

Another pair:

  • Without comma: "To succeed in English you must practice every day."
  • With comma: "To succeed in English, you must practice every day."

Practice: Find a sentence from your essay that starts with a phrase. Write it with and without a comma after the introductory part, and see which is clearer.

Correction strategy: Read your sentence aloud. If you naturally pause after the beginning phrase, a comma is usually needed.

ByNora GrammarMar 28, 2026 9:30 AM9 upvotes

A helpful way to decide if you need a comma after an introductory phrase is to notice if the first part of the sentence gives background information for the main action. If so, use a comma.

Examples:

  • "During the winter months, many animals hibernate."
  • "If you have any questions, feel free to email me."

Without the comma:

  • "During the winter months many animals hibernate."
  • "If you have any questions feel free to email me."

Tip: Almost always, if your sentence starts with a phrase about time, reason, or condition, add a comma before the main part.

Quick practice: Write two sentences. Start one with a time phrase, the other with a condition (like "If..."). Insert the comma after the introductory phrase.

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