Mastering English prepositions: when to use on and in with days of the week

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Mastering English Prepositions: When to Use "On" and "In" with Days of the Week

In the English language, prepositions are words that show the relationship between different elements in a sentence. Two common prepositions that often cause confusion for English learners are "on" and "in" when used with days of the week. Understanding when to use each preposition correctly is essential for mastering English grammar. In this comprehensive guide, we will delve into the nuances of using "on" and "in" with days of the week to help you improve your language skills and avoid common mistakes.

Understanding the Difference Between "On" and "In"

Before we discuss how to use "on" and "in" with days of the week, let’s first clarify the general differences between these prepositions.

  • On: "On" is used to indicate specific days and dates. It is often used when referring to days of the week, such as Monday, Tuesday, etc., and specific dates, such as December 25th or January 1st.

  • In: "In" is used to indicate longer periods of time, months, seasons, or years. It is used to talk about a more general time frame rather than specific days or dates.

Now that we have established the basic differences between "on" and "in," let’s explore how these prepositions are used with days of the week.

Using "On" with Days of the Week

"When to use days of the week with "on":

  1. On + Day of the Week: Use "on" when specifying a particular day of the week. For example, "I have a meeting on Monday" or "We will go hiking on Saturday."

  2. On the Weekend: When referring to the weekend, use "on" followed by "Saturday" or "Sunday." For example, "I like to relax on the weekend."

  3. On Specific Dates: Use "on" when mentioning specific dates that fall on a particular day of the week. For example, "Our anniversary is on September 10th."

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Using "In" with Days of the Week

"When to use days of the week with "in":

  1. In + Day of the Week: Use "in" before the name of a day of the week when referring to a more general time frame. For example, "I have appointments in the afternoon on Monday."

  2. In the Morning/Afternoon/Evening: When specifying a general time of day with a day of the week, use "in." For example, "I like to go for a run in the morning on Tuesdays."

Frequently Asked Questions (FAQs)

  1. Can I say "in Monday" instead of "on Monday"?

    No, "in" is not used before individual days of the week. Use "on" when referring to specific days like Monday, Tuesday, etc.

  2. Is there a rule for when to use "in" or "on" with days of the week?

    Yes, "on" is used for specific days, while "in" is used for more general time frames or periods.

  3. Can I use "in the Monday" to refer to Mondays in general?

    No, you should use "on Mondays" to refer to days of the week in general.

  4. Are there any exceptions to the usage of "on" and "in" with days of the week?

    There are no strict exceptions, but following the general rules will help you use these prepositions correctly.

  5. How can I practice using "on" and "in" with days of the week?

    Practice by making sentences using different days of the week and pay attention to the prepositions used in each sentence.


Mastering the use of prepositions like "on" and "in" with days of the week is essential for improving your English language skills. By understanding the subtle differences between these prepositions and practicing their usage, you can communicate more effectively and accurately. Remember to use "on" for specific days and dates and "in" for general time frames when talking about days of the week. Keep practicing and honing your language skills to become more confident in using English prepositions correctly.