有些动词后既可接to do，也可接doing，它们后接to do与doing在意思上有时有较大的差别。而这两个调皮的“娃娃”是中考的老朋友了，我们要学会辨析它们。
1.stop to do/stop doing sth
解析：stop to do sth.意为“停下来(正在做的事)去做(另外的)某事”
stop doing sth.意为“停止做(正在做的)某事”。如
Mary stopped to speak to me.玛丽停下(手头的工作)来跟我讲话。
When the teacher came in .the students stopped talking. 老师进来时，学生们停止讲话。
2.remember to do/remember doing sth
解析： remember to do sth .意为“记住要去做某事”(还没有做)。
remember doing sth. 意为“记得(已经)做过某事”如：588.es
Please remember to send the letter for me.请记住为我发这封信。
I don't remember eating such food somewhere .我不记得在哪里吃过这种食物
3.forget to do/forget doing sth
解析： forget to do sth .意为“忘记做某事”(动作还没有发生)。
Forget doing sth. 意为“忘记做过某事”(动作已发生)。如：
Don't forget to bring your photo here.别忘了把你的相片带来。
I have forgotten giving the book to him.我忘记我已把书给了他。
4.go on to do/go on doing sth
解析： go on to do sth.意为“做完一件事，接着做另外一件事”，两件事之间有可能有某种联系。
go on doing sth.意为“继续做下去”。如：
After reading the text ,the students went on to do the exercises .学生们读完课文后，接着做练习。
It's raining hard ,but the farmers go on working on the farm.虽然天正下着大雨，但农民们继续在农场干活。
5.try to do/try doing sth
解析：try to do sth.意为“尽力去做某事”，
try doing sth.意为“(用某一种办法)试着去做某事”。如：
Try to come a little early next time ,please.下次请尽量早点来。
You can try working out the problem in another way.你可以试试用其它的方法解答这道题目。
6.can't help to do/can't help doing sth
解析：can't help to do为动词不定式结构;
can't help doing sth.意为“身不由己地去做某事”或“情不自禁地去做某事。”如：
We can't help to finish it.我们不能帮忙完成此事。
I couldn't help laughing when I saw her strange face.当我看到她奇怪的脸时，我情不自禁地笑了。
7.hear sb. do/hear sb.doing sth
解析：hear sb. do sth.意为“听见某人做某事”，指听到了这个动作的全过程;
Hear sb. doing sth.意为“听到某人做某事”，指听到时候，这个动作正在发生。如：
I often hear him sing in the classroom.我经常听见他在教室里唱歌。
Do you hear someone knocking at the door?你听见有人在敲门吗?
应该说明的是：和hear的用法一样的还有see、watch、notice等。