try:
“ The story starts when John and Mary are in the park and see an ice-cream man coming to the park. John wants to buy an ice cream, but does not have money. The ice-cream man tells John that he can go home and get money, because he is planing to stay in the park all afternoon. Then John goes home to get money. Now, the ice-cream man changes his mind and decides to go and sell ice cream in the school. Mary knows that the ice-cream man has changed his mind. She also knows that John could not know that (e.g., John already went home). The ice-cream man goes to school, and on his way he passes John's house. John sees him and asks him where is he going. The ice-cream man tells John that he is going to school to sell ice cream there. Mary at that time was still in the park—thus could not hear their conversation. Then Mary goes home, and later she goes to John's house. John's mother tells Mary that John had gone to buy an ice cream.
where does mary think john went?”
this is the “ice cream van test”: https://www2.biu.ac.il/BaumingerASDLab/files/publications/nu... [pdf]