1. be going to and will can often be used in the same way to make predictions.
Labour costs are going to increase over the next five years.
2. Be going to is used in predictions which are based on present evidence. (基于客观事实或者当前依据而做出的推测)
We're going to have logistical problems, because the system has shut down.
present evidence = the system has shut down
prediction = have logistical problems
3. Both be going to and the present continuous are used to describe definite future arrangements.
I am going to fly to Peru tonight.
I am flying to Peru tonight.
听友140957729
老师讲的太对了
听友82142347
更新更新
听友82217550
谢谢。很开心
听友82102587
我想把你的名字写进我的结婚证书里
听友82972666
口才一流