一般情況下,to do 是一般將來式,是打算去做什么 ；doing 是現(xiàn)在進(jìn)行式,是現(xiàn)在正在做什么,也有例外,具體情況具體分析.
to do和doing 意義各不同
　　1 stop doing/to do 　　　　stop to do 停止,中斷做某事后去做另一件事.　　　　stop doing 停止做某事.
They stop to smoke a cigarette.他們停下來,抽了根煙.I must stop smoking.我必須戒煙了.
　　2 forget doing/to do forget to do 忘記要去做某事.(未做) forget doing 忘記做過某事.(已做)
The light in the office is stil on.He forgot to turn it off.辦公室的燈還在亮著,它忘記關(guān)了.(沒有做關(guān)燈的動(dòng)作) He forgot turning the light off.他忘記他已經(jīng)關(guān)了燈了.( 已做過關(guān)燈的動(dòng)作) Don't forget to come tomorrow.別忘了明天來.(to come動(dòng)作未做)
　　3 remember doing/to do remember to do 記得去做某事 (未做) remember doing 記得做過某事 (已做)
　　Remember to go to the post office after school.　　記著放學(xué)后去趟郵局.　　Don't you remember seeing the man before?　　你不記得以前見過那個(gè)人嗎?
　　4 regret doing/to do 　　　　regret to do 對要做的事遺憾.(未做) 　　　　regret doing 對做過的事遺憾、后悔.(已做)
I regret to have to do this,but I have no choice.　　我很遺憾必須這樣去做,我實(shí)在沒有辦法.I don't regret telling her what I thought.　　我不為告訴她我的想法而后悔.
　　5 cease doing/to do 　　　　cease to do 長時(shí)間,甚至永遠(yuǎn)停做某事.　　　　cease doing 短時(shí)停止做某事,以后還會(huì)接著做.
That department has ceased to exist forever.那個(gè)部門已不復(fù)存在.The girls ceased chatting for a moment when their teacher passed by.姑娘們在老師走過時(shí),停了會(huì)聊天.
　　6 try doing/to do try to do 努力,企圖做某事.try doing 試驗(yàn),試著做某事.
　　You must try to be more careful.　　你可要多加小心.　　I tried gardening but didn't succeed.　　我試著種果木花卉,但未成功.
　　7 go on doing/to do 　　　　go on to do 做了一件事后,接著做另一件事.　　　　go on doing 繼續(xù)做原來做的事.
After he had finished his maths,he went on to do his physics.做完數(shù)學(xué)后,他接著去做物理.Go on doing the other exercise after you have finished this one.作完這個(gè)練習(xí)后,接著做其他的練習(xí)
　　8 be afraid doing/to do 　　　　be afraid to do 不敢,膽怯去做某事,是主觀上的原因不去做,意為"怕"； 　　　　be afraid of doing 擔(dān)心出現(xiàn)doing的狀況、結(jié)果.doing 是客觀上造成的,意為"生怕,恐怕".
　　She was afraid to step further in grass because she was afraid of being bitten by a snake.　　她生怕被蛇咬著,而不敢在草叢中再走一步.　　She was afraid to wake her husband.　　她不敢去叫醒她丈夫.　　She was afraid of waking her husband.　　她生怕吵醒她丈夫.
　　9 be interested doing/to do interested to do 對做某事感興趣,想了解某事.interested in doing 對某種想法感興趣,doing 通常為想法.
　　I shall be interested to know what happens.　　我很想知道發(fā)生了什么事.(想了解) 　　I'm interested in working in Switzerland.Do you have any idea about that?　　我對在瑞士工作感興趣.你想過這事嗎?(一種想法)
　　10 mean to doing/to do mean to do 打算、想 mean doing 意味著
I mean to go,but my father would not allow me to.我想去,但是我父親不肯讓我去.To raise wage means increasing purchasing power.贈(zèng)加工資意味著增加購買力.
　　11 begin(start) doing/to do begin / start to do sth begin / start doing sth.
　　1) 談及一項(xiàng)長期活動(dòng)或開始一種習(xí)慣時(shí),使用doing.How old were you when you first started playing the piano?你幾歲時(shí)開始彈鋼琴?　　2) begin,start用進(jìn)行時(shí)時(shí),后面動(dòng)詞用不定式to do I was beginning to get angry.我開始生起氣來.　　3) 在attempt,intend,begin,start 后接know,understand,realize這類動(dòng)詞時(shí),常用不定式to do.I begin to understand the truth.我開始明白真相.　　4) 物作主語時(shí) It began to melt.
　　12 感官動(dòng)詞 + doing/to do 感官動(dòng)詞 see,watch,observe,notice,look at,hear,listen to,smell,taste,feel + do 表示動(dòng)作的完整性,真實(shí)性；+doing 表示動(dòng)作的連續(xù)性,進(jìn)行性 I saw him work in the garden yesterday.昨天我看見他在花園里干活了.(強(qiáng)調(diào)"我看見了"這個(gè)事實(shí)) I saw him working in the garden yesterday.（強(qiáng)調(diào)"我見他正干活"這個(gè)動(dòng)作） 昨天我見他正在花園里干活.