问题补充：
you use(be going to)when someone has decided to do something before怎么翻译呀
答案：
你用（be going to）当某人决定做某些事情之前
======以下答案可供参考======
供参考答案1:
yes, you e right. Because Be going to (used as future simple tense) means that you plan to do sth. in the near future.
供参考答案2:
没说清楚啊
