Sentence 1: Lisa was at the beach with a friend. 
 Sentence 3: Lisa's friend asked to borrow the surfboard 
 Sentence 4:  The friend lost the surfboard in the waves 
 Sentence 5:  The girls chased the board until it washed up on the shore 
 Option 1: Lisa had brought her swimsuit along. 
 Option 2: Lisa had brought her surfboard along.