orget to do sth 忘記要去做某事（未做） ， forget doing sth 忘記以前曾經(jīng)做過(guò)某事（已做）
例如：Sorry,I forgot to bring the book.(對不起，我忘了帶書(shū)了。)
I forgot borrowing a book from you.（我忘記曾經(jīng)向你借過(guò)書(shū)這件事）
I forget to turn off the light.(表示我沒(méi)有關(guān)燈，我忘記了）
I forget turning off the light(表示我關(guān)燈了，但是忘記做過(guò)這件事
The light in the office is stil on. He forgot to turn it off.
辦公室的燈還在亮著(zhù)，它忘記關(guān)了。(沒(méi)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(guò)關(guān)燈的動(dòng)作)
Don't forget to come tomorrow. 別忘了明天來(lái)(to come動(dòng)作未做)?！ ?/span>
典型例題
---- The light in the office is still on.
---- Oh，I forgot___.
A. turning it off B. turn it off C. to turn it off D. having turned it off
答案：C。由the light is still on 可知燈亮著(zhù)，即關(guān)燈的動(dòng)作沒(méi)有發(fā)生，因此用forget to do sth. 而forget doing sth表示燈已經(jīng)關(guān)上了，而自己忘記了這一事實(shí)。此處不符合題意。
stop doing sth是“停止做某事”，doing是stop 的賓語(yǔ)，是要停止的動(dòng)作，
stop to do sth 是“停下來(lái)開(kāi)始做某事”（ 中斷做某事后去做另一件事
），to do是stop的狀語(yǔ)，表示目的，是要開(kāi)始做的事情，例如：
1、The two girls stopped talking when they saw me 那兩個(gè)女孩一見(jiàn)到我就停止了講話(huà)。
2、The two girls stopped to talk to me when they saw me. 這兩個(gè)女孩一看到我就停下來(lái)和我講我。
They stop to smoke a cigarette. 他們停下來(lái)，抽了根煙。
I must stop smoking. 我必須戒煙了。
e.g. Hearing the doorbell,she stopped washingthe dishes. 聽(tīng)見(jiàn)門(mén)鈴聲，她停止洗碗了。
e.g. Hearing the dollbell, she stopped to open the dor. 聽(tīng)見(jiàn)門(mén)鈴聲，她停下手中的活去開(kāi)門(mén)。典型例題
She reached the top of the hill and stopped ___ on a big rock by the side of the path.
A. to have rested B. resting C. to rest D. rest
答案：C。由題意可知，她到了山頂，停下來(lái)在一個(gè)路邊的大石頭上休息。因此，應選擇"stop to do sth. 停下來(lái)去做另一件事"。而不僅僅是爬山動(dòng)作的終止，所以stop doing sth.不正確。
remember to do 表示記得去做某事 (未做) remember doing 表示記得做過(guò)某事 (已做)
Remember to go to the post office after school. 記著(zhù)放學(xué)后去趟郵局。 Don‘t you remember seeing the man before? 你不記得以前見(jiàn)過(guò)那個(gè)人嗎? 類(lèi)似的還有：forget to do 忘記要去做某事。 (未做) forget doing 忘記做過(guò)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(zhù)，它忘記關(guān)了。(沒(méi)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(guò)關(guān)燈的動(dòng)作) Don‘t forget to come tomorrow. 別忘了明天來(lái)。 (to come動(dòng)作未做) 典型例題 ---- The light in the office is still on. ---- Oh，I forgot___. A. turning it off B. turn it off C. to turn it off D. having turned it off 答案：C。由the light is still on 可知燈亮著(zhù)，即關(guān)燈的動(dòng)作沒(méi)有發(fā)生，因此用forget to do sth. 而forget doing sth表示燈已經(jīng)關(guān)上了，而自己忘記了這一事實(shí)。此處不符合題意。 regret to do 對要做的事遺憾。 (未做) regret doing 對做過(guò)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(méi)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。 典型例題 ---You were brave enough to raise objections at the meeting. ---Well, now I regret ___ that. A. to do B. to be doing C. to have done D. having done 答案：D。regret having done sth. 對已發(fā)生的事感到遺憾。regret to do sth. 對將要做的事感到遺憾。本題為對已說(shuō)的話(huà)感到后悔，因此選D。
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