推荐回答（1个）
都是用来表示将来时，区别如下：
1. will do 是表意愿eg. Now if you will take off your clothes, we will fit the new clothes on you in front of the mirrow.
2. be going to 表将来 a) 主语的意图，即将要做某事eg. What are you going to do tomorrow? b)计划，安排要发生的事eg. The play is going to be produced next month. c)有迹象要发生的事eg. Look at the dark clouds, there is going to be a storm
3.be to do 是指按计划或正式安排将发生的事eg. We are to discuss the report next Saturday.从上面我们可以看出will 一般表意愿be going to do 表将来，含有主观的打算或计划be to 表示客观安排或受人指示而做某事现再就be going to do 和 be to 举两例：i am to play football tomorrow afternoon. (客观安排，如这儿有场比赛定在明天下午，不去不行，不能由主观决定)i'm going to play football tomorrow afternoon. (主观安排，如我只是和朋友约了明天下午踢足球以消遣时间，可去可不去，可由主观决定)
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