be going to, be to do, be about to do 有什么区别
推荐回答（4个）
都表示将来时 be going to do是有计划的，还有一种情况表示天气要怎么怎么样了一定要用be going to 的结构。比如 天要下雨了：It’s going to rain.
be to do的计划性非常强。比如： The President is to visit Nigeria next month.总统计划在下个月访问尼日利亚。
be about to do就是马上，相当于soon，所以后面不可以加具体时间状语。 这是高中语法，我确定。
两者都是将来时，表示将要做什么，但是be going to 比 be about to 的离说话人现在的时间长一些，be about to 表示马上就要做，很随机的，be going to的计划性强一点点。
例：Tim,have you lock the door，we’ll leave？
Oh，I am about do to it.
I’m going to swimming tomorrow.
be
doing
正在做
will
be
doing
将要在做某事
be
about
to
do
是（已经决定下来的）将来要做某事
be
going
to
do是计划打算做某事
will
do
表意愿，较主观，想要做活着会做某事
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