Rewrite each sentence with the correct comma usage for parenthetical expressions. Use the “Check Answer” button to see mistakes and the “See Explanation” button for feedback.
1. Commas in fact are used to separate items in a list.
2. Parenthetical expressions by the way are set off with commas.
3. Commas after all are essential for clarity in writing.
4. Introductory phrases however should be followed by a comma.
5. Non-essential clauses on the other hand are set off with commas.