You must fix ALL the errors. If you do not, you will simply get the paper back so that you can do so. Until you have, your grade will be recorded as a 50. The following guidelines should help you. If the word that means the owner does not end in s, add an 's to it.
Students work long hours.
A few items still need to be finished. Boys will be boys. Radios are a wonderful invention. D. Possessive pronouns do not need an apostrophe. This section on apostrophes is from the materials of Joan Schell Style Points If you lost style points, you will find that the number lost is equal to the sum of negative numbers in the right margin of your paper.