Then he guided us to the teaching building. It was big and beautiful.

然后他带我们去了教学楼。它又大又漂亮。

As for our teacher, Mr. Li, he stood in front of the teaching building, looking at us and offering help when necessary.

至于我们的李老师， 他就站在教学楼前，看着我们，并在需要的时候提供帮助。