Sentence 1: Roxy and Sam had everything they needed to make a huge sand castle. 
 Sentence 3: After lunch they started construction 
 Sentence 4:  By evening, everyone was gathered around their masterpiece 
 Sentence 5:  It was the biggest sand castle they had ever built 
 Option 1: They spent the morning talking about their design. 
 Option 2: They gathered all of the buckets and shovels they needed.