一、概念：
表示将要发生的动作或存在的状态及打算、
计划或预备做某事。句中一般有以下时间状语：
tomorrow, next day(week, month, year…),soon, the day after tomorrow（后天）等。
二、基本结构：①be going to do；②will do.
三、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.
四、同义句：
be going to = will
1.be going to
表示将要发生的事或打算、计划、决定要做的事情。
1. 肯定句：be going to +动词原形，如：
Jim is going to play football.
否定句：be not going to +动词原形，如：
Jim is not going to play football.
一般疑问句：把be动词调到句首，如：
Is Jim going to play football?
特殊疑问句：疑问词+be+主语+going to+动词原形?如：
What is Jim going to do?
疑问词当主语时：疑问词+be+going to+动词原形?如：
Who is going to play football?
4 I am going to go swimming tomorrow（明天）.
= I will go swimming tomorrow.