( 1、兩者均可表示“深”、“深深地”，修飾具體的動作, 有時可互換：
The doctor asked me to breathe deep [deeply]. 醫(yī)生叫我做深呼吸。
2、修飾靜止狀態(tài)、介詞短語或表示深夜等，通常用deep(偶爾也用deeply)：
He sat there deep in thought. 他坐在那兒深思。
The meeting continued deep into the night. 會議一直開到深夜。
Karen and Dave are deeply in love with each other. 凱倫與戴夫倆人深深地相愛著。
3、修飾帶有感情色彩的動詞(如 hate, dislike, love, admire, hurt, regret 等)，通常要用 deeply，另外，修飾形容詞、過去分詞等，一般也要用 deeply：
He deeply hates fish. 他很不喜歡吃魚。
We deeply regret your misfortune. 我們對你的不幸深表遺憾。
I am deeply grateful to you. 我衷心感謝你。
He was deeply moved by [at] the story. 聽了這個故事，他深受感動
The doctor asked me to breathe deep [deeply]. 醫(yī)生叫我做深呼吸。
2、修飾靜止狀態(tài)、介詞短語或表示深夜等，通常用deep(偶爾也用deeply)：
He sat there deep in thought. 他坐在那兒深思。
The meeting continued deep into the night. 會議一直開到深夜。
Karen and Dave are deeply in love with each other. 凱倫與戴夫倆人深深地相愛著。
3、修飾帶有感情色彩的動詞(如 hate, dislike, love, admire, hurt, regret 等)，通常要用 deeply，另外，修飾形容詞、過去分詞等，一般也要用 deeply：
He deeply hates fish. 他很不喜歡吃魚。
We deeply regret your misfortune. 我們對你的不幸深表遺憾。
I am deeply grateful to you. 我衷心感謝你。
He was deeply moved by [at] the story. 聽了這個故事，他深受感動