Part 1. Definition
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Part 2. Example
Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Answer: Who believes Fagin's gang make wallets and handkerchiefs?.
Explanation: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.
Part 3. Exercise
Passage: The film begins at Heathrow Airport, where a Polish immigrant named Lena Malley is working a shift as a cleaner. While there, her colleague Birdie helps her to clean the toilets. The two begin to talk and Lena reveals that she lives alone and doesn't keep in touch with her family. Birdie introduces Lena to her adopted brother Elbie, who also works at the airport and is a mute. Lena tells Birdie that she doesn't get on with her family. While talking, Lena notices scars on Birdie's arm; Birdie explains that she used to have behavioral problems; but that she's better now. At the end of the shift Lena misses her bus so Birdie tells her that her dad will drive Lena home if they walk to Birdie's house.
Upon arriving at the house Lena is knocked out from behind and injected with a syringe. She wakes up tied to a chair to the sound of screaming coming from another room. Moments later Mum and Dad enter the room and introduce themselves. Mum tells Lena that if she does what she is told everything will be ok. Lena is unable to respond because of the injection she received earlier and Mum proceeds to inject her with a sedative. When she wakes up again Mum begins carving marks into her back. 
Lena is unable to speak, and Mum tells her to not try to talk. She gives Lena another injection, and Lena falls asleep. She wakes up later, tied to a frame. Mum tells her that she wanted another girl to come and live there. Mum then pierces Lena's skin with some metal and carves some marks into her back. Following this incident Lena is taken to see Dad who tells her that in his house she will follow his rules
At breakfast, the family are watching pornography. Lena makes an escape attempt but Dad grabs her and Elbie drags her back to the table.
Answer:
Who walks to Birdie's house?