to do 作狀語一般是表目的
而doing則是指那個狀態
比如說：He did his homework，listening classical music.他聽着古典音樂在做家庭作業
To get a satisfying score，he devoted his much time and energy to studying.爲了取得一個好成績，他把大量的時間和精力都投入到了學習上
動詞不定式做目的狀語和現在分詞作目的狀語的具體區別如下
【1】不定式作目的狀語，帶有很強的目的性。有時爲了突出和強調目的性，可以把不定式置於句首，或者在不定式前加in order或so as（但so as to do不可位於句首）。
One of my old friends came to see me from Beijing yesterday.我的一個老朋友昨天從北京來看我。
In order to ensure success， we must make a complete and thorough plan.爲了保證成功，我們必須要有一個周密的計劃。
The speaker raised her voice so as to make herself heard.爲了讓別人聽見，演講者提高了嗓門兒。
【2】現在分詞作目的狀語，目的性不是非常明確。它往往帶有伴隨性，目的和伴隨兼而有之。多放於句末，且與主句用逗號隔開。
Many young farmers hunted around from city to city， hoping to get good jobs. 許多年輕的農民從一個城市到另一個城市，希望得到好工作。
The secretary worked late into night， preparing a report for the manager.祕書爲了給經理準備一個報告而工作到深夜。
She kept it a secret， trying not to lose her job.她對此保守祕密，儘量別丟掉工作
