最佳解答: "He is lazy" means this person has been lazy all his life. He is just a lazy person. 懶人，無救了。
"He is being lazy" means perhaps he is just taking things a little slow for the time being. Example: When someone was given a task and didn't start working on it after three days, you can say "he is being lazy." 偷懶而已。
"He is lazy."現在式表示一個事實或重複發生的動作，翻譯為他生性懶惰He always forgets his purse.
"He is being lazy." 現在進行式表示一個時段所發生事件，翻譯為他最近較懶惰，有強調用意，(可能最近失戀、失業等因素)
所以延伸使用現在進行式表示短暫會結束亦可使用，I am doing exercise.但有些非連續動詞不能用進行式，如 dislike,deny,own,cost--------