What is a fragment and why do I need to fix them?

A fragment is like a train without an engine. It may look kind of pretty just sitting there, but it doesn't work, and it won't take your reader anywhere. It will only frustrate him.

For example, if I walked into the room and said to you, "When I woke up this morning..."

You'd say, "So, what happened?"  And if I didn't tell you more, you'd be probably be somewhat  frustrated with me.

Fragments are incomplete thoughts. To read more about Fragments and how to fix them, click here and here.

Understanding how sentences are put together will help us avoid making some basic mistakes in our writing. 
The first few exercises are an opportunity for you to practice identifying sentence types. We have identified three types so far: simple, compound, and complex. 

There is one more type of sentence that you should be familiar with. 

It is called a compound-complex sentence. Very simply, this type of sentence has at least two independent clauses (compound) and at least one dependent clause (complex). 

Click here to review the four sentence types. 

Here are some more online exercises to help you:

• Identifying Sentence Types Practice 1
• Identifying Sentence Types Practice 2
• Identifying Sentence Types Practice 3
• Fragment Practice 1
• Fragment Practice 2
• Prepositions Practice 1
• Prepositions Practice 2
• Prepositions Practice 3
For this final exercise, you will find a long list of prepositions followed by many opportunities to practice using prepositions. Read over the list of prepositions and then do some of the practice exercises.