When writing or speaking in English, it’s common to come across words that look almost identical but have different meanings depending on how they’re used. One such pair is “Sundays or Sunday’s.” At first glance, they seem similar, but their grammatical roles and meanings are quite different. Understanding the distinction between the two helps you write with clarity and accuracy. Let’s break it down in detail.

The Basic Difference: Sundays or Sunday’s

The main difference between Sundays or Sunday’s lies in grammar — one is plural, and the other is possessive.

• Sundays → Plural form of Sunday
  
• Sunday’s → Singular possessive form of Sunday
  

Both are correct, but they are used in different contexts depending on what you want to express.

Related: Bearer or Barer

When to Use “Sundays”

Use Sundays when you’re referring to more than one Sunday — that is, multiple Sundays in a week, month, or year.

Examples:

• I usually visit my grandparents on Sundays.

• The store remains closed on Sundays.

• We go to church every Sundays during the summer. (should be “every Sunday” — “every” makes it singular)

• I’ve been jogging every morning for three Sundays in a row.

Tip:
You use Sundays the same way you would use Mondays, Tuesdays, or any other plural day of the week.

When to Use “Sunday’s”

Use Sunday’s when showing possession or association — meaning something belongs to or is related to Sunday.

Examples:

• Sunday’s weather was perfect for a picnic. (the weather that belonged to Sunday)

• Don’t forget about Sunday’s meeting. (the meeting happening on Sunday)

• Sunday’s newspaper had an interesting article.

Here, the apostrophe ’s shows that something is of Sunday or happening on Sunday.

Tip:
Think of Sunday’s as a shorter way to say “the [thing] of Sunday.”
For example:

• “Sunday’s match” = “the match of Sunday”

• “Sunday’s dinner” = “the dinner on Sunday”

Common Mistakes

Many English learners confuse Sundays and Sunday’s because they sound the same when spoken. Let’s clear up the most common mix-ups:

 I go to the gym on Sunday’s.
I go to the gym on Sundays.
(You’re talking about a routine — plural form, not possession.)

 Sundays newspaper was interesting.
Sunday’s newspaper was interesting.
(You’re showing possession — the newspaper belonging to Sunday.)

Related Forms

There’s also Sundays’ — a plural possessive form, which is used rarely. It refers to something belonging to multiple Sundays.

 Example:

• The Sundays’ events were always fun to attend. (events belonging to several Sundays)

Quick Grammar Comparison Table

Form	Type	Meaning	Example
Sunday	Singular noun	One specific day	I’ll see you on Sunday.
Sundays	Plural noun	More than one Sunday	We play cricket on Sundays.
Sunday’s	Singular possessive	Belonging to or related to Sunday	Sunday’s lunch was delicious.
Sundays’	Plural possessive	Belonging to multiple Sundays	The Sundays’ schedules were always busy.

Memory Tip

Here’s an easy trick to remember the difference between Sundays or Sunday’s:

• If you can replace the word with “on Sunday” → use Sundays.
• If you can replace it with “of Sunday” → use Sunday’s.
•  I rest on Sundays. (You can say “on Sunday.”)
•  Sunday’s tasks are done. (You can say “the tasks of Sunday.”)

Final Thoughts

Both Sundays or Sunday’s are correct, but they serve different grammatical purposes. Use Sundays when referring to more than one Sunday (plural). Use Sunday’s when referring to something belonging to Sunday (possessive).

By understanding this simple yet important distinction, your English writing will be more precise and professional. So, next time you’re writing about your weekend plans, you’ll know exactly when to use Sundays or Sunday’s — and you’ll never mix them up again.