stop doing/to do
stop to do 停止，中斷做某事後去做另一件事。
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.. 我必須戒菸了。
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，停下來在一個路邊的大石頭上休息。因此，應選擇"stop to do sth. 停下來去做另一件事"。而不僅僅是爬山動作的終止，所以stop doing sth.不正確。