will是表示将来的一般用法
be going to do有……的趋势（如天气变化）,也有计划要做（I'm going to have a walk.）
be about to do正要做……（I was about to go out when the phone rang.）
be to do有计划,安排,命令的意思,有时可以翻成应该.（The door is to be locked.你要把门关上）
will \be doing to do \be about to do \be to do的区别
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