Nathan entered the playroom. Nathan exited the playroom. William entered the hall. Sophia entered the hall. The watermelon is in the blue bathtub. Sophia exited the hall. William moved the watermelon to the red cupboard. William exited the hall. Sophia entered the hall.
The watermelon at the beginning was in the blue bathtub.
 the watermelon at the beginning was in the red_cupboard
 the watermelon at the beginning was in the blue_bathtub