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.
Mason think that William searches for the grapefruit in the red bathtub.
 Mason think that William searches for the grapefruit in the blue_bathtub
 Mason think that William searches for the grapefruit in the red_bathtub