新概念英语第一册第52课课文人称怎样转化

原文：

We were in the garden when we heard the noise. We looked up and saw a beautiful aeroplane flying low over our heads.

转换：

当我们听到噪音时，我们正在花园里。我们抬头一看，看见一架美丽的飞机在我们头顶上低空飞行。