Please check.
3. Our apartment is downtown; theirs is uptown.
4. "Then," the witness continued, "we heard someone yell" 'Who's in there?'
5. Could you find the article "Gulliver's Travels Revisited" in our library?
6. Sheila asked, "Is Chapter 3 of Winter Tales called 'Up the Creek'? "
7. That law,which net real needs a century ago should be updated.
8. Chuck is already as tall as, if not taller than ,his father.
3. Correct
4. Wrong
5. Correct
6. Correct
7. Another comma is needed.
8. Another comma is needed.