why Christopher find difficult to tell people what he needs and how he feels? Can you give an example?

Imagine not being able to understand how you feel. Imagine feeling sad, but not knowing that you were sad. Or feeling happy but not knowing that you are happy. To Chritopher, emotions are just day-to-day things that he has to deal with. Siobhan trys to help him understand emotions using facial exoressions, but, to try and understand his own emotions, he bases his 'feelings' of how many coloured cars are in a row on his way to school. This is very hard to understand and I don't think anyone will fully understand this concept but I hope this answered your question? :)