I am going to be doing sth和I am going to do sth有什么区别?

I am going to America和I am going to go to America有什么区别? i am going to swim 和i am going to go swimming有什么区别呢 I will和I am going to有什么区别? 有没有I am going to do sth 这样的句型 be going to sth和 will do sth有什么区别? i am going 和i am going to 的区别 I plan to do sth和I am planning to do sth的区别 i am going to beijing ,与i am going to go to beijing 有什么区别 英语语法：i am going to..和 i am about to 有什么区别 i am going to be 英语be going I am going to Shanghai和I am going to go to Shangh be going to do sth.和will do sth.有什么不同?