8.1 stop doing/to do stop to do 停止，中断做某事后去做另一件事，stop doing 停止做某事。例如： they stop to smoke a cigarette. 他们停下来，抽了根烟。 i must stop smoking. 我必须戒烟了。 典型例题 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。由题意可知，她到了山顶，停下来在一个路边的大石头上休息。因此，应选择\"stop to do sth. 停下来去做另一件事\"。而不仅仅是爬山动作的终止，所以stop doing sth.不正确。 8.2 forget doing/to do forget to do 忘记要去做某事，forget doing 忘记做过某事。例如：
