Dear Ann,
How are you?
I am very happy to have received the birthday gift from you.I really like the book you sent me because I am always interested in detective stories.It was such a brilliant choice that you chose Shelock Holmes.The plot was very fascinating and I couldn't stop reading it!Thank you very much,Ann.
I have to go now.Write soon!
Love,
Kate
意思是Ann送了本福尔摩斯的书给你,然后因为你一向很喜欢侦探故事,所以你很感谢她.