The students are waiting for the bus now用aThe students are waiting for the bus now用at that time yesterday改写句子

The students are waiting for the bus now用aThe students are waiting for the bus now用at that time yesterday改写句子
The students are waiting for the bus now用a
The students are waiting for the bus now用at that time yesterday改写句子

The students are waiting for the bus now用aThe students are waiting for the bus now用at that time yesterday改写句子
改写：
The students were waiting for the bus at that time yesterday.