begoingtodo和betodo的区别

be going to 表将来，含有主观的打算或计划
主语的意图，即将要做某事eg.
What are you going to do tomorrow?
计划，安排要发生的事
The play is going to be produced next month.
有迹象要发生的事
Look at the dark clouds, there is going to be a storm.

be to do 是指按计划或正式安排将发生的事，或受人指示而做某事
We are to discuss the report next Saturday

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)

be dong表示一般情况或者可以理解为现在的情况。例如：what she likes is watching TV
be to do表示将来要做的。例如：what l want is to teach
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习惯做某事 和 做过某事 吧