Practice
Monday or Mondays: choosing the right form
The interview is on Monday. The language class meets on Mondays. One sentence names a single day; the other describes a routine.
Use Monday for one named day, Mondays for a repeated weekly day, and Monday's when something belongs to or is associated with that day.
Read and practice
Read the examples and try the written questions in this guide. Listening recordings are not available for this lesson yet.
Try the written questions
Monday and Mondays /ˈmʌndeɪ/ and /ˈmʌndeɪz/
The short answer
Use Monday for one specific Monday. Use Mondays for repeated or general Mondays. Use Monday's before a noun when you mean something connected with that Monday, such as Monday's appointment. The capital letter stays in every form because Monday is a day name.
Our office is closed on Mondays.
Why it works: Mondays means every Monday as part of the office's regular schedule.
5 more examples
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I will send the invoice on Monday.
The speaker means one planned day, so the singular day name is right.
Not this:I send invoices
on Mondays. What changes: The plural form shows a regular weekly task rather than one planned date. -
Monday is the first workday for our team.
The sentence names the day as one item in the week.
Not this:
Mondays areusually quiet at the library. What changes: The plural form refers to Mondays in general, so it takes the plural verb are. -
Monday's meeting has moved to the afternoon.
The apostrophe shows that the meeting is associated with one Monday.
Not this:Meetings are held
on Mondays. What changes: This sentence describes a repeated schedule, so it uses the ordinary plural form with no apostrophe. -
The train leaves early on Monday morning.
Monday identifies one morning in the plan.
Not this:The train leaves early
on Monday mornings. What changes: Monday mornings means the same time on a repeated weekly schedule. -
We need to finish Monday's report before lunch.
The report belongs to the work or schedule for that Monday.
Not this:We finish reports
on Mondays. What changes: The plural form says that finishing reports is a regular Monday activity.
Read the full guide
First, ask whether the sentence points to one date or to a repeated pattern. A plan for next week usually needs Monday. A timetable or habit often needs Mondays. The apostrophe form has a different job: it introduces a thing that belongs to, happens on, or is associated with one Monday.
Name one day with Monday
Use Monday when you mean one particular day. It often follows on, next, last, this, or a date. The listener can usually identify which Monday from the plan or conversation.
The repair person will arrive on Monday.
The plan is for one arrival, so Monday stays singular.
Choose the form for one appointment next week: The appointment is on ___.
Use Monday: The appointment is on Monday.
Use Mondays for a regular schedule
Add s when the event happens on more than one Monday as part of a routine. This is common with work schedules, opening hours, classes, and habits.
She volunteers at the food bank on Mondays.
The plural form tells us that volunteering happens repeatedly, not on one date only.
Choose the form for a weekly class: The class meets on ___.
Use Mondays: The class meets on Mondays.
Use Monday's for a connected thing
Monday's is possessive. It normally appears before a noun and tells you that the noun belongs to, happens on, or is linked with one Monday. It does not mean several Mondays.
Monday's workshop is in Room 12.
The workshop is connected to one Monday, so the apostrophe form comes before the noun workshop.
Complete the phrase: ___ agenda includes two new items.
Use Monday's: Monday's agenda includes two new items.
Notice every Monday
Every is followed by a singular noun, even when the meaning is repeated. Say every Monday, not every Mondays. The word every already gives the repeated meaning.
Every Monday, the manager checks the weekly schedule.
Every makes the pattern clear, so Monday remains singular.
Choose the form after every: Every ___, I call my parents.
Use Monday: Every Monday, I call my parents.
Check the sentence before adding an apostrophe
The endings of Mondays and Monday's sound alike, but their meanings differ. If the word describes repeated days, choose Mondays. If it comes before a noun and shows a connection with one day, choose Monday's.
Monday's deadline is firm, but deadlines on Mondays are common for this project.
Monday's modifies deadline. Mondays names the days when deadlines usually occur.
Which form describes a usual opening day: The store opens late on ___?
Use Mondays: The store opens late on Mondays.
Before you go
Remember this
Use Monday for one named day. Use Mondays for repeated days or Mondays in general. Use Monday's before a noun when that noun is connected to one Monday. Keep the capital M in each form.
Practice with the written examples
You can practice with the written questions in the Learn tab. Each answer includes an explanation.
Try the written questionsListening test not available yet
This lesson does not have the recordings needed for a listening test. Use the written questions in the guide to check your understanding.
Try the written questionsQuestions about "Monday or Mondays: choosing the right form"
Should I write on Monday or on Mondays?
Write on Monday when you mean one particular day in a plan, message, or story. Write on Mondays when the event happens regularly every week or when you mean Mondays in general. The context decides whether the day is a single date or a repeated pattern.
I will send the invoice on Monday.
Why does Monday always have a capital letter?
Monday is the name of a day of the week, so English treats it as a proper noun and capitalizes it. Keep the capital M in Monday, Mondays, and Monday's. Adding a plural or possessive ending does not change the capitalization of the day name.
I send invoices on Mondays.
What is the difference between Mondays and Monday's?
Mondays is the plural form for more than one Monday or for a regular Monday schedule. Monday's is a possessive form that usually comes before a noun, such as Monday's meeting. The two endings can sound alike, so use the sentence meaning and the next word to choose the spelling.
Monday is the first workday for our team.
Can I say every Mondays?
No. Use every Monday because every is followed by a singular countable noun. The word every already tells the reader that the action happens repeatedly. You can also say on Mondays when you want to describe a regular weekly schedule without using every.
Mondays are usually quiet at the library.
Can Monday refer to a day in the past?
Yes. Monday can refer to an upcoming day or to the Monday that has just passed, depending on the surrounding conversation or time expression. In I met her on Monday, the listener uses the context to understand which particular Monday the speaker means.
Monday's meeting has moved to the afternoon.