Grammar · StudentHub Lesson
Punctuation Essentials
Master commas, semicolons, and other punctuation marks to write clear sentences.
What you will learn
- Use commas correctly in lists and clauses
- Distinguish semicolons from commas
- Apply apostrophes for possession and contractions
- Use end punctuation appropriately
- Fix common comma errors
Watch the lesson
Comma story - Terisa Folaron · TED-Ed
Watch on YouTubeTopic notes
Main Idea
Punctuation marks guide readers through sentences, showing pauses, connections, and endings. The comma is one of the most useful and misused marks.
Key Concepts
- Commas separate items, clauses, and introductory phrases
- Semicolons connect closely related independent clauses
- Apostrophes show possession or missing letters
- Periods, question marks, and exclamation points end sentences
Definitions
- Comma: pause mark separating clauses/items
- Semicolon: joins two related independent clauses
- Apostrophe: shows possession ('Sam's book') or contraction (don't)
- Serial/Oxford comma: comma before 'and' in a list
Structures / Templates
- Use a comma before FANBOYS joining independent clauses
- Use a comma after an introductory clause: 'After the game, we ate.'
- Use a semicolon between two related independent clauses: 'It rained; we stayed inside.'
Examples
- 'Let's eat, Grandma!' vs 'Let's eat Grandma!' shows how a comma changes meaning
- 'She bought apples, oranges, and pears.' (Oxford comma)
Common Mistakes
- Comma splices joining two full sentences with only a comma
- Overusing commas in short sentences
- Confusing its/it's or apostrophe placement in plurals
Key concepts
Important terms
- Semicolon
- Punctuation joining two closely related independent clauses.
- Apostrophe
- Mark showing possession or a missing letter in a contraction.
- Oxford comma
- The comma before 'and' in a list of three or more items.
Quick revision
- Commas separate list items
- Comma after introductory phrase
- Semicolon joins related independent clauses
- Apostrophe = possession or contraction
- Avoid comma splices
- Oxford comma prevents ambiguity
- End punctuation shows sentence purpose
Check your understanding
Question 1 · Multiple choice
Which mark joins two closely related independent clauses?
Question 2 · Multiple choice
What does an apostrophe show in 'don't'?
Question 3 · True or false
'Let's eat, Grandma!' and 'Let's eat Grandma!' mean the same thing.
Question 4 · Short answer
What is the comma before 'and' in a list called?
Question 5 · Multiple choice
Joining two independent clauses with only a comma is called a:
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