Formal vs. Informal

Lesson ID: 14006

In the days of quick, informal texts and short, friendly emails, it's important to know when and how to use a formal writing style. Your friends wouldn't mind you using slang, but your teacher might!

1To2Hour
categories

Writing

subject
English / Language Arts
learning style
Auditory, Visual
personality style
Lion, Otter
Grade Level
Middle School (6-8)
Lesson Type
Dig Deeper

Lesson Plan - Get It!

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You probably use slang with your friends that your parents don’t understand.

Slang comes and goes—but every once in a while, a word sticks.

One word from the 1800s didn’t just stick… it took over the world.

You use it all the time.

It can mean yes, no, maybe, or even “I guess.”

  • So what’s the word?

okay in a speech bubble

While it's okay to use "okay" when messaging friends and family, it's not okay in formal writing!

  • Do you remember the difference between formal and informal writing styles?
  • What makes a piece of writing formal or informal?

Communication changes depending on who you are talking to.

Think about how a text to a friend sounds compared to an email to a teacher. They probably look very different—and that’s on purpose.

There are two main styles of writing: formal and informal.

Informal writing is relaxed and casual. It sounds like the way you speak with people you know well. You might use:

  • contractions (like don’t or can’t)
  • slang (like cool or awesome)
  • emojis or abbreviations in digital messages

This style is great for conversations with friends, quick notes, or personal writing.

Formal writing is more structured and serious. It is used when the situation matters or when the reader expects a professional tone. In formal writing:

  • ideas are clearly explained
  • sentences are complete and carefully written
  • word choices are more precise and respectful

Using the right style matters. The way a message is written can change how others understand it—and how they view the writer.

A casual message might be fine for a friend, but it could seem careless or disrespectful in a school or professional setting.

Choosing between formal and informal writing helps make sure the message fits the situation.

Here is a summary of what makes a piece of writing formal.

  1. There are no contractions.
  2. There are no personal pronouns.
  3. There are no slang words.
  4. There is more complicated language.
  5. There are longer sentences.

So, when should you use a formal style?

A formal style is used for the following.

  • academic essays and books
  • formal invitations (for weddings, graduations, military appointments, and other formal ceremonies)
  • business letters
  • resumes
  • legal documents

An informal style is used for the following.

  • personal letters
  • notes
  • texts
  • emails
  • diaries
  • journals

See if you can match the style of writing with the occasion.

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Move to the Got It? section to practice some more!

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