给定一篇英语文章，将文章中的所有动词改为现在分词形式。
文章示例：“John is walking to the store to buy groceries. He loves cooking and is making dinner tonight. As he walks, he sees a dog chasing a cat.”
John is walking --> John is walking 

to the store to buy groceries --> to the store to buy groceries 

He loves cooking --> He loves cooking 

and is making dinner tonight --> and is making dinner tonight 

As he walks --> As he is walking 

he sees a dog chasing a cat --> he sees a dog chasing a cat