online shopping是網上購物的意思，而shop online則是在網上購物的意思，區別可以從以下例子看出：
During covid 19 pandemic， online shopping is crucial， we should learn how to shop online. 在covid 19大流行期間，網上購物至關重要，我們應該學習如何網上購物。
區別就是online shopping為名詞而shop online為動詞，具體的不同如下
online shopping中文意思是n，網路購物，網上購物
Online shopping is a new way of shopping.
shop online中文意思是線上購物，網上購物
In recent years， there is a growing tendency for people to shop online， and most people more or less have the experience of shopping online.
