shifting of tenses

例句：

1. 1. The weather is changing rapidly.
   天气正在迅速变化。
2. 2. The company is shifting its focus to a new product line.
   公司正在将重点转移到一个新的产品线上。
3. 3.The economy is shifting towards a more sustainable model.
   经济正在向更可持续的模式转变。