Some examples of misplaced modifiers would be the following:
Jamie built a sand castle with her sister covered in seashells. (sister = covered in seashells)
Correction: Jamie built a sand castle covered in seashells with her sister. (sand castle = covered in seashells)
Waiting impatiently, the line Cody was standing in trailed around the block. (line = waiting impatiently)
Correction: Cody, waiting impatiently, was standing in a line that trailed around the block. (Cody = waiting impatiently)
Kathy brought a donut to her teacher from the café. (teacher = from the café)
Correction: Kathy brought a donut from the café to her teacher. (donut = from the café)