Grammar trouble in writing center

Today I went to the writing center to review my rhetoric analysis. It was a very beneficial time, but I realized some common grammar mistakes I repeatedly do. The most frequent mistake I do is not using a common after a introductory clause.

The rule to this grammar correction is that introductory clauses are dependent clauses that provide background information or "set the stage" for the main part of the sentence, the independent clause. For example,

• If they want to win, athletes must exercise every day. (introductory dependent clause, main clause)
• Because he kept barking insistently, we threw the ball for Smokey. (introductory dependent clause, main clause)

All introductory clauses begin with adverbs like after, although, as, because, before, if, since, though, until, when, etc.

For more information go to http://owl.english.purdue.edu/handouts/grammar/g_commaint.html