Double negatives

 Double negatives is a common error when using English language. Using two negatives in the same sentence gives the opposite meaning, but it does the job awkwardly. Avoiding that error is pretty easy; you just have to memorize some words and avoid using them in the same sentence.
 The words are: no, not, nobody, nothing, none, never, hardly, scarcely, barely, only, and basically any other negative word.

Examples: 

• She shouldn't eat nothing.
• I didn't see nothing.
• We could hardly see through the fog.
• She did not have anything to read.

The exercise really speaks for itself. The words colored in red are obviously wrong, the words colored in blue are obviously right and the reason is stated above.

If you need to answer some exercises you can do that on:

http://wps.ablongman.com/long_fowler_lbh_10/47/12267/3140448.cw/index.html