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 really is in the red cupboard.
 the watermelon really is in the blue_bathtub
 the watermelon really is in the red_cupboard