ing怎么用？求助小学英语

一般现在时的时候会用刀，加在动词之后，就是be+doing，表示动作正在进行
另外，动名词也会用到，比如enjoy+doing，诸如此类的
小学生只要知道第一种就好了，我说的第二种基本上你记住几个固定搭配，记住动词后面不能直接跟另一个动词原型,要不加to，要不加doing，有时候看上去是加了动词原型，其实是把to省略掉了。

ing又分为动名词和动词的现在分词两种。在现代语法中不再具体强调其分别的，统一的叫做动词的ing形式。

ing形式可以作句子的主语
如 Smoking is a bad habit.
ing做宾语
I like sleeping.
ing做定语（多含有主动、正在进行、使得...的含义）
The sleeping baby is my son.
The exciting news made them break into tears.
ing做宾补
The result of the test made the student crying.

还有好多，建议你可以查下语法书关于非谓语动词和动名词的部分。
1.正在进行时中,谓语动词后加ing.如:I'm playing football.
2.当动词做主语时,要用动名词,即动词加ing.如:
Making salad.
3.一些特殊表达.动词后再用动词要用动名词.如:enjoy doing sth. practice doing sth. mind doing sth. finish doing sth. keep doing sth.等
下列结构含有ing:
1. keep doing
2. keep /carry on doing
3. keep sb. Doing
4. enjoy doing
5. finish doing
6. be afraid of doing
7. be worth doing
8. be busy doing
9.