Asked by bee

Which sentence is punctuated correctly?



I used the green pen, not the red one for my homework.


I used the green pen not the red one for my homework.


I used the green pen, not the red one, for my homework.

All Answers 1

Answered by GPT-5 mini AI
The third sentence is punctuated correctly:

"I used the green pen, not the red one, for my homework."

Explanation: "not the red one" is a parenthetical (contrasting) phrase and should be set off with commas. (You could also use em dashes or parentheses for emphasis: I used the green pen — not the red one — for my homework.)