怎么 知道什么时候用go for go on go ing

"Go for"通常用于表示决定或选择做某件事情，例如:

• I think I'll go for a walk. (我想去散步。)
• She decided to go for the job offer. (她决定接受这个工作机会。)
• Let's go for pizza tonight. (今晚我们去吃披萨吧。)

"Go on"通常用于表示继续做某件事情，例如:

• Please go on with your story. (请继续讲你的故事。)
• He went on to explain the details. (他接着解释了细节。)
• The lecture went on for two hours. (讲座持续了两个小时。)

"Going"通常用于表示正在进行的动作，例如:

• I'm going to the gym. (我正要去健身房。)
• They are going shopping. (他们正要去购物。)
• She is going through a difficult time. (她正在经历困难时期。)

因此，根据语境来判断使用哪个词是正确的。