L2: Apostrophe for Contractions

L2: Apostrophe for Contractions: Use an apostrophe to indicate where a letter or letters have been left out in contractions.  See Writing for Success Section 3.5 pp. 119-120 or the following: http://grammar.ccc.commnet.edu/grammar/marks/apostrophe.htm

Do not walk on the grass with the seeds on it.

Don’t walk on the grass with the seeds on it.

It is a wonder that we made it to San Diego in four hours.

It’s a wonder that we made it to San Diego in four hours.

Let us go down to where the waves are crashing.

Let’s go down to where the waves are crashing