Sentence Fragment: frag 
EXPLANATION: 
 
You might be very surprised when your teacher¡¦s face turn blue on putting down this comment.  What is wrong? You are making a frequently made but absolutely unacceptable mistake!  

Do you remember what a sentence is? Right! A sentence consists of a SUBJECT and a PREDICATE.  Without either of them, you are making a fragment.  Usually, fragments are actually clauses or phrases, not sentences.

Here are some helpful sites to help you improve your sentence skill:
http://www.maclab.uvic.ca/writersguide/Pages/SentFrags.html
http://owl.english.purdue.edu/files/67.html
http://www.columbia.edu/acis/bartleby/strunk/strunk.html#7
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