3、be going to 表示根據主觀判斷將來肯定發生的事情，will表示客觀上將來勢必發生的事情。
4、be going to 含有“計劃，準備”的意思，對于未經過考慮的打算，計劃，只是臨時之意，則用will 結構，不用be going to 結構。
5、在有條件從句的主句中，一般不用 be going to, 而多用will。
相關例句
be going to
1、Reading between the lines, it seems neither Cole nor Ledley King will be going to Japan.
言外之意，科爾和萊德利·金兩個人似乎都不會去日本了。
2、If you happen to be going to the post office, please get me some commemorative stamps.
你上郵局的話，捎帶給我買幾張紀念郵票。
3、Life is too short to be going to work every day unhappy.
生命太過短暫，何必每天不開心地工作。
will
1、The Prime Minister is now 64 years old and in all probability this will be the last election that he is likely to contest
首相現年64歲，這多半將會是他可能參加的最后一次選舉了。
2、I will say no more on these matters, important though they are
雖然這些事很重要，我也不想再說什么了。
3、Will you stay for supper?
你愿意留下吃晚飯嗎？