问题补充：
the boy is my brother.He is wearing an orange T-shirt 【合为一句】
答案：
the boy who is wearing an orange T-shirt is my brother.
======以下答案可供参考======
供参考答案1:
the boy with an orange T-shirt is my brother
供参考答案2:
The boy wearing an orange T-shirt is my brother.
供参考答案3:
The boy (who is) wearing an orange T-shirt is my brother.
供参考答案4:
The boy who is wearing an orange T-shirt is my brother.
供参考答案5:
The boy with an orange T-shirt is my brother.
