William entered the porch. Mason entered the porch. The grapefruit is in the blue bathtub. Mason moved the grapefruit to the red bathtub. William exited the porch.
William think that Mason searches for the grapefruit in the red bathtub.
 William think that Mason searches for the grapefruit in the blue_bathtub
 William think that Mason searches for the grapefruit in the red_bathtub