Introduction
Good writing is not only about using the right words. It is also about choosing the correct grammar and making sentences clear. When you understand grammar, your ideas become easier to read, whether you are writing a school essay, a story, an email, or a social media post.
Figurative language also makes writing more interesting. Literary devices such as metaphors, similes, personification, imagery, and descriptive language help readers picture ideas and feel emotions. Creative writers often combine strong grammar with poetic expression to create memorable sentences. Even when learning simple grammar topics, practicing with comparison examples, sentence examples, vocabulary enhancement, and writing skills can make you a better communicator.
One grammar question many English learners ask is on Friday or in Friday. Since both on and in are common prepositions, it is easy to become confused. However, only one of these choices is correct when talking about a specific day of the week.
This guide explains the difference in simple language with clear examples, common mistakes, practice exercises, and helpful tips.
Understanding Prepositions of Time
Prepositions are small words that show relationships between words in a sentence. Some prepositions tell us when something happens.
The three most common time prepositions are:
PrepositionUsed ForExampleAtExact timeAt 8:00 AMOnDays and datesOn MondayInMonths, years, seasons, long periodsIn July
Remember this simple rule:
- At = Time
- On = Day
- In = Month, Year, Season
Because Friday is a day of the week, English uses on, not in.
Correct:
- I will visit you on Friday.
- She arrived on Friday morning.
Incorrect:
- I will visit you in Friday.
- She arrived in Friday morning.
Why “On Friday” Is Correct
The preposition on is always used before:
- Days of the week
- Specific dates
- Holidays with dates
- Particular days
Examples:
- We have science class on Friday.
- The movie starts on Friday.
- My birthday falls on Friday this year.
- They got married on Friday.
- Our exam is on Friday afternoon.
Think of a day as a point on your weekly calendar. English places events on that day.
Simple memory trick:
ON = One Day
Whenever you mention one specific day, choose on.
Why “In Friday” Is Incorrect
The phrase in Friday is not standard English.
The preposition in is used for longer periods of time, such as:
- Months
- Years
- Seasons
- Centuries
- Parts of the day (sometimes)
Examples:
- In April
- In 2026
- In winter
- In the morning
- In the future
Notice that none of these refer to a single weekday.
Wrong:
- We met in Friday.
Correct:
- We met on Friday.
Wrong:
- The shop opens in Friday morning.
Correct:
- The shop opens on Friday morning.
Quick Comparison Table
Correct ExpressionIncorrect ExpressionReasonOn FridayIn FridayFriday is a dayOn MondayIn MondayDays use “on”On Sunday eveningIn Sunday eveningSpecific dayIn JulyOn July (alone)Months use “in”In 2025On 2025Years use “in”At 5 PMOn 5 PMClock times use “at”
Sentence Examples in Different Situations
School
- Our test is on Friday.
- We submit homework on Friday.
- Sports day is on Friday.
Work
- The meeting is on Friday.
- I’ll finish the report on Friday.
- The office closes early on Friday.
Family
- We visit Grandma on Friday.
- Dad cooks dinner on Friday.
- We watch movies on Friday night.
Travel
- Our flight leaves on Friday.
- They arrived on Friday afternoon.
- We return home on Friday evening.
Daily Conversation
- See you on Friday!
- Let’s meet on Friday.
- I called him on Friday.
Common Mistakes English Learners Make
Many learners translate directly from their first language. This often causes mistakes with prepositions.
Mistake 1
Incorrect:
I came in Friday.
Correct:
I came on Friday.
Mistake 2
Incorrect:
School starts in Monday.
Correct:
School starts on Monday.
Mistake 3
Incorrect:
The game is in Friday evening.
Correct:
The game is on Friday evening.
Mistake 4
Incorrect:
We traveled in Friday morning.
Correct:
We traveled on Friday morning.
Mistake 5
Incorrect:
My exam was in Friday.
Correct:
My exam was on Friday.
When to Use “In”
Although “in Friday” is wrong, in has many correct uses.
Use in with months.
Example:
- School starts in September.
Use in with years.
Example:
- I was born in 2014.
Use in with seasons.
Example:
- Flowers bloom in spring.
Use in with parts of the day.
Examples:
- In the morning
- In the afternoon
- In the evening
Use in with long periods.
Examples:
- In the future
- In ancient times
- In history
Figurative Language and Grammar Together
Learning grammar does not stop you from writing creatively. In fact, correct grammar helps figurative language sound smoother and more natural.
Metaphor Examples
- Friday is the finish line of the week.
- Friday is a bright light after busy days.
- Success is a mountain to climb.
Simile Examples
- Friday feels like sunshine after rain.
- She smiled like a blooming flower.
- The classroom was as quiet as a library.
Personification
- Friday welcomed everyone with happiness.
- The wind whispered through the trees.
Imagery
- Golden sunlight filled the classroom on Friday afternoon.
- Colorful leaves danced across the playground.
Using descriptive language makes writing richer while correct grammar keeps it accurate.
Tone Usage in Different Writing Styles
Formal Writing
Use complete sentences.
Example:
The conference will begin on Friday.
Informal Writing
Natural conversation is fine.
Example:
See you on Friday!
Academic Writing
Be precise.
Example:
The experiment was conducted on Friday.
Creative Writing
Add vivid descriptions.
Example:
The town came alive on Friday evening as lights sparkled across the streets.
Idioms and Expressions with Friday
English includes several interesting expressions involving Friday.
Thank Goodness It’s Friday (TGIF)
Meaning:
People are happy because the workweek is ending.
Example:
Everyone shouted, “TGIF!”
Black Friday
Meaning:
A shopping day with many discounts after Thanksgiving in the United States.
Example:
Many stores have huge Black Friday sales.
Friday Feeling
Meaning:
The excitement people feel before the weekend.
Example:
Everyone had the Friday feeling before school ended.
Tips for Better Writing Skills
Strong grammar and vocabulary improve every type of writing.
Helpful tips include:
- Read books regularly.
- Learn one new word each day.
- Practice writing daily.
- Check grammar before submitting work.
- Use descriptive language.
- Try comparison examples.
- Include literary devices naturally.
- Avoid translating directly from another language.
- Review common prepositions.
- Read your writing aloud.
These habits improve vocabulary enhancement and overall writing skills.
Practice Exercises
Exercise 1
Choose the correct answer.
- We will meet ___ Friday.
A. in
B. on
Answer: on
- School begins ___ September.
A. on
B. in
Answer: in
- The train arrives ___ Friday morning.
A. on
B. in
Answer: on
- I was born ___ 2015.
A. in
B. on
Answer: in
- Dinner starts ___ 7 PM.
A. at
B. on
Answer: at
Exercise 2
Correct these sentences.
- We traveled in Friday.
- School starts in Monday.
- They arrived in Friday evening.
- My birthday is in Friday.
- I met her in Friday afternoon.
Correct Answers:
- We traveled on Friday.
- School starts on Monday.
- They arrived on Friday evening.
- My birthday is on Friday.
- I met her on Friday afternoon.
Quick Grammar Summary Table
Time ExpressionCorrect PrepositionFridayOnMondayOnWeekend (American English)OnJulyInSummerIn2026InMorningIn8:00 AMAtMidnightAtChristmas DayOn
Frequently Asked Questions
1. Is “in Friday” ever correct?
No. Standard English always uses on before a weekday.
2. Why do we say “on Friday”?
Because English grammar uses on for specific days and dates.
3. Can I say “this Friday” without “on”?
Yes.
Examples:
- I’ll visit this Friday.
- I’ll visit on Friday.
Both are correct.
4. What preposition is used with months?
Use in.
Examples:
- In August
- In December
5. How can I remember the rule easily?
Use this simple pattern:
- At = Time
- On = Day
- In = Month, Year, Season
This memory trick works in most everyday situations.
Conclusion
Choosing the correct preposition may seem like a small grammar detail, but it makes a big difference in clear communication. Since Friday is a specific day of the week, the correct expression is always on Friday, while in Friday is incorrect in standard English.
Understanding time prepositions helps students, writers, and English learners avoid common grammar mistakes and write with greater confidence. At the same time, practicing figurative language, literary devices, comparison examples, descriptive language, metaphor examples, simile examples, poetic expression, and vocabulary-building activities makes writing more engaging and expressive. By combining correct grammar with creative writing techniques, you can produce sentences that are both accurate and enjoyable to read.
Keep practicing, review the simple rule—at for time, on for days, and in for longer periods—and you’ll use English more naturally in school, at work, and in everyday conversations.