He is giving the students a talk on healthy diet in the hall.为什么要用is giving?
问题描述：
He is giving the students a talk on healthy diet in the hall.为什么要用is giving?
答
表示正在做讲座,所以用现在进行时啊.
他正在大厅里给学生们做一个关于健康饮食的讲座.