will，表示将要发生的事或主语的”意愿“，可以表示客观规律必然发生的.
如：They will visit our school next week.
Crops will die without water.
be going to.表示主语”计划，打算，安排“做的事.可以表示说话人根据某种迹象主观推测可能发生的事.
如：He is going to get married next is going to rain tomorrow.
gonna=going to.口语化.
We gonna to have sports meet next Friday=We are going to have sports meet next Friday
一，①going to / not going to
plans decided before the conversation 在谈话之前已决定了计划high certainly 高度肯定会发生= gonna / not gonna
如: I’m going to go to France next year.
(去法国是大计划，需提前决定而且很可能会发生。)
如:I decided that I’m not going to go out for dinner. I’m too tired.
(过去式，决定了未来的计划。)
二，will / won’t
decision at moment of speaking 说话时才决定low certainty 发生机率低通常会出现 probably 的字眼
如:. Maybe I’ll go hiking tomorrow.
(maybe>低机率发生机会，用 will。)
如: I will have a glass of wine， please.
(通常在餐厅or酒吧or买东西时，如我要点菲力牛排. 我要买蛋. 我要点whiskey….，这种情况都是当下做的决定，就会用 will。)
如: you’re running late， so you will have to take a taxi to your next meeting.
(现在进行式，而对未来可能发生的决定，用 will。)
如:
You’re not going to the party? Then I probably won’t go either.
