If the IRS hasn't raised any issues about your 2005 tax return by now, it is safe to shred it. Last, you should keep any tax return that includes a claim for deducting worthless securities for seven years. If you've lost or discarded a tax return and later need a copy, don't worry.
Rule 2 in the âApostrophesâ section says, âUse the apostrophe to show possession. Place the apostrophe before the s to show singular possession.â. Since âworldâs biggestâ is singular possessive, you need to use âs regardless of which noun follows it.
Common rules for apostrophe use. Possessive common nouns are common nouns or pronouns that own other nouns. Apostrophes are used to indicate this possession in the following ways: 1  If the noun does not end in-s (in most cases this means it is singular), add -'s.