2、基本结构：
①be going to + do。
②will+ do。
3、否定句：在be动词（am, is, are）l后加not或情态动词will后加not成won't。
例如：i'm going to have a picnic this afternoon.→ i'm not going to have a picnic this afternoon。
4、一般疑问句： be或will提到句首，some改为any, and改为or，第一二人称互换。
例如：we are going to go on an outing this weekend. → are you going to go on an outing this weekend。