Dependent Clause Fragments
Sentence Fragments give the reader only part of a complete thought or sentence.  There are two major types of sentence fragments.
Dependent Clause Fragments place a subordinating conjunction in front of what would be a complete sentence.
Examples: I made a “D” in that class. Although I came to class every day.
I jumped for joy; because I was happy.
I decided to cut class. Since it was such a beautiful day.