Is Your Sentence a Fragment?
No Verb: A movie with pointless twists. VS. The movie has pointless twists.
No subject: For not doing her own homework, Missy was expelled. VS. Missy was expelled for not doing her own homework.
Beginning with Subordinate Clause: Because the band didn’t know the street address, the party was impossible to find. VS. The band couldn’t find the party because no one knew the address.