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Learn Afaan Oromoo
What is a Letter?
A letter is a written message sent from one person to another. It can be a physical document or an electronic message. Letters are a form of communication used for centuries to share information, ideas, feelings, and requests.
Different Kinds of Letters
Letters can be classified into various types based on their purpose, and formality.
1. Based on Formality
Formal Letters: These letters are written formally, often for official or business purposes. They follow a specific format and use polite and respectful language. Examples include business letters, job applications, complaint letters, etc.
Formal letters are characterized by:
- Clear and concise language
- Specific purpose
- Adherence to a standard format
- The polite and respectful tone
- Formal closing (e.g., Sincerely, Yours faithfully)
Informal Letters: These letters are more personal and relaxed, often written to friends or family. They use casual language and do not follow a strict format. Examples include friendly letters, thank-you letters, invitations, etc.
Informal letters are characterized by:
- Casual and conversational language
- Personal tone
- Flexible format
- Friendly closing (e.g., Best wishes, Love)
2. Based on purpose
Business Letters: Used for professional communication, such as job applications, inquiries, complaints, etc.
Personal Letters: Written for personal reasons, such as friendship, family, or love.
Formal Invitations: Used for formal events like weddings, parties, or conferences.
Informal Invitations: Used for casual gatherings or events.
Complaint Letters: Used to express dissatisfaction with a product or service.
Thank-You Letters: Used to express gratitude for a gift, favor, or kindness.
Apology Letters: Used to apologize for a mistake or wrongdoing.
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Preposition of Time (in, on, and at)
What is Preposition
A preposition is a short word that is employed in sentences to show the relationship nouns, pronouns or phrases have with other parts within the respective sentences.
The prepositions “in,” “at,” and “on” are used to indicate time in English. They can be tricky because they don’t always translate directly to other languages.

“In” is used for longer periods of time
- The largest, most general periods.
- Centuries: 21st ,20th, 19th,… ,
- Decades: years in 2025, in 2024, in 2023…,
- Seasons: in the spring, in the winter, in the summer, in the autumn,
- Months: January, February, March, April, ….,
- Parts of day: in the morning, in the afternoon,
- Longer periods: in the past, in the future, in a few weeks
Examples
- She was born in 1990.
- We go skiing in the winter.
- I like to read in the evening.
- The flowers bloom in the spring.
- I love to swim in the summer.
“On” is used for days and dates
- The more specific periods.
- Days of week: on Monday, Tuesday, Wednesday, …
- Dates: on January 8th , on July 17th, on my birthday, …
- Specific days + parts of day: on Monday morning, on Friday evening….
- Holidays with “day”: on Christmas day, on new year’s day….
Examples
- The party is on Saturday.
- His birthday is on June 15th.
- I’ll see you on Tuesday morning.
“At” is used for the most specific times
- The most specific time:
- Specific time: at 3:00PM, at 11:00AM, at 6:30PM…
- Mealtimes: at breakfast, at lunch, at dinner
- Night: at night
- The weekend: at the weekend(BE, on the weekend(AE
- Specific points in time: at the moment, at the same time, at the age of 25….
Examples
- I’ll meet you at 5 o’clock.
- We eat dinner at 7 pm.
- She always goes to church at Christmas.
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