be going to表达“打算，计划，有意做某事”。其肯定句形式为主语+be（am/is/are）going to+动词原型；否定句形式为主语+be not going to+动词原型；一般疑问句形式为be+主语+going to do sth.；特殊疑问句形式为疑问词+be+主语+going to do sth.
1.肯定句：be（am/is/are）going to+动词原型
（1）I am going to help with the housework.我要帮忙做家务。
（2）He/She/It is going to help with the housework.TA要帮忙做家务。
（3）You/They/We are going to help with the housework.你们/他们/我们要帮忙做家务。
2.否定句：主语+be not going to+动词原型
（1）I am not going to see a movie.我不想去看电影。
（2）He/She/It isn’t going to see a movie.TA不想去看电影。
（3）You/We/They aren’t going to see a movie.你们/我们/他们不想去看电影。
3.一般疑问句：be+主语+going to do sth.
（1）-Am I going to do sth.？-Yes,I am./No,I’m not.
（2）-Is he/she/it going to do sth.？-Yes,he is./No,she isn’t.
（3）-Are you/we/they going to do sth.？-Yes,you are./No,you aren’t.
例如：-Are you going to check your email？-Yes,I am.
4.特殊疑问句：特殊疑问词+be+主语+going to do sth.
（1）时间When
（2）地点Where
（3）人物Who
（4）事情What
（5）原因Why
例如：When are they going to have a picnic?他们什么时候去野餐？
