This is my friend... — 英语阅读题

阅读短文，回答问题。 Hi, I'm Peter. Look at the photo of my class. The boy under the tree is my friend, Sam. He is tall and he likes playing basketball. This is my friend, Amy. She is next to Sam. She is short and her hair is long. She likes reading books. We often play together after school. Sam can help me with basketball, and Amy can help me with English. I'm happy to have good friends like them. Question: Who is the tall boy under the tree? 请用短文中的句式回答。（可用简短英语或中文作答）