首先我们来看下be going on、be going for和be going to的大致意思：
be going on：词性为短语，表示某事物正在进行或发生
be going for：词性为短语，表示某人打算或有意向做某事
be going to：词性为短语，表示某人打算或准备去做某事
通过下面的表格我们了解下be going on、be going for和be going to的含义、发音和用法
接下来让我们看下be going on、be going for和be going to的用法区别：
1.词性：be going on和be going for都是动词短语，而be going to是动词短语 + 不定式结构
例子：
- The meeting is going on.
(The meeting is going on.)
- He is going for a walk.
(He is going for a walk.)
- I am going to visit my grandparents.
(I am going to visit my grandparents.)
2.含义：be going on表示正在进行的动作或事件，be going for表示有意向或打算去做某事，be going to表示打算或准备去做某事
例子：
- What's going on in the kitchen?
(What's going on in the kitchen?)
- She is going for a swim tomorrow.
(She is going for a swim tomorrow.)
- They are going to have a party next weekend.
(They are going to have a party next weekend.)
3.发音：be going on的英式发音是 bi: ˈɡəʊɪŋ ɒn，美式发音是 bi ˈɡoʊɪŋ ɑːn；be going for的英式发音是 bi: ˈɡəʊɪŋ fɔː(r)，美式发音是 bi ˈɡoʊɪŋ fɔr；be going to的英式发音是 bi: ˈɡəʊɪŋ tuː，美式发音是 bi ˈɡoʊɪŋ tu
例子：
- What's going on in the living room?
(What's going on in the living room?)
- He is going for a job interview.
(He is going for a job interview.)
- She is going to buy some groceries.
(She is going to buy some groceries.)
4.用法简介：be going on用于描述正在进行的动作或事件，be going for用于表达打算、计划或有意向去做某事，be going to用于表示打算、计划或准备去做某事
例子：
- What's going on here?
(What's going on here?)
- I am going for a run this evening.
(I am going for a run this evening.)
- She is going to travel to Europe next month.
(She is going to travel to Europe next month.)
Be going to”的用法
“Be going to”在句子中的形式为：主语+“be going to”+动词原型。“Be”动词的形式随着主语的变化而变化。
1.“Be going to”用来谈论个人意图或打算
我们用“Be going to”来谈论未来的计划、打算或意图，通常关于未来计划的决定已经做出。“Go”的意思为“去”，“Be going”的意思为“正在去”，意味着决定作出后，准备工作已经在路上了。例如：
He’s going to be a painter when he grows up.他长大后要成为一名画家。（决定已经做出，现在正在努力学习绘画知识和技能）
2.“Be going to”用来谈论对未来的预测
我们用“Be going to”来预测某事会发生，通常是根据已有的证据或经验来推断。例如：
According to the performance analysis of the group stage, Argentina is going to be the favourite to win the 2022 World Cup. 按照小组赛表现分析，2022年世界杯夺冠热门应该是阿根廷。（根据已有证据来推断）
3.“Be going to”用来发出命令或声明某事是必须做的
我们用“Be going to”来发出命令或声明某事是必须做的，语气比较委婉。例如：
You are going to review your lessons tonight. There will be an exam tomorrow. 你今晚要复习功课，明天有考试。（妈妈对孩子发出命令，但语气委婉）
“I’m not hungry”. 我不饿。“You are going to eat”. 你必须吃点东西。（委婉地劝别人必须做某事）
4. “be going to”用来表达某事即将发生
我们用“Be going to”表示即将发生某事。“Be going”的进行体也暗示这件事正在发生的路上。例如：Get out of the way! The ladder is going to fall. 快走开！梯子要倒了。Get back! The bomb is going to explode. 回来！炸弹就要爆炸了。(炸弹爆炸即将发生)