Write letters as instructed. 1. Write a formal letter to the librarian of the local library, requesting information on the availability of some books that you need. 2. Write a formal thank you' letter to your teacher, who gave you extra help with your maths lessons. 3. Write an informal thank you' letter to your uncle, who sent you an interesting book for your birthday. 4. Write an informal letter to your friend with details about the new music lessons you are taking write any one of the letters in them