8.1 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。
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，停下來在一個(gè)路邊的大石頭上休息。因此，應(yīng)選擇"stop to do sth. 停下來去做另一件事"。而不僅僅是爬山動(dòng)作的終止，所以stop doing sth.不正確。
8.2 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)
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，即關(guān)燈的動(dòng)作沒有發(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
2012年大學(xué)英語四級(jí)語法大全-特殊詞精講1
來源：育路教育網(wǎng)發(fā)布時(shí)間：2011-12-08
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