Сначала уберем ошибки из задания 6 а
3 The song is for his sister (Cэм- мальчик!)
4 Her name is Erica ( Эрика - сестра Сэма, она девочка!)
6b
Our caller is Julie. She is eight. Song is for her brother. His name is Peter and he is ten on Wednesday.
(I'm (ваше имя). They are my friends. - в задании сказано составить текст про Julie, Pete and you!)