grammar.about.com/od/tests/a/introsc

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Introduction to Sentence Combining

This exercise will introduce you to sentence combining--that is, organizing sets of short, choppy sentences into longer, more effective ones. However, the goal of sentence combining is not to produce longer sentences but rather to develop more effective sentences--and to help you become a more versatile writer.

Sentence combining calls on you to experiment with different methods of putting words together. Because there are countless ways to build sentences, your goal is not to find the one "correct" combination but to consider different arrangements before you decide which one is the most effective.