1．构成：shall / will be + 现在分词
2．功能：
（1）表示将来某个时刻正在进行的动作：
What will you be doing this time tomorrow?
〖比较：〗
Tom won't cut the grass because he is afraid of being tired.
说明意图
Tom won't be cutting the grass.
无意图、仅陈述事实
（2）用将来进行时询问别人的计划、打算比用一般将来时更显礼貌 。
Will you be having supper with us this evening?
（3）She will be arriving at Shanghai tomorrow morning.
The car will be going at the speed of 100 miles an hour.
过去将来进行时：
1．构成：should / would be + 现在分词
2．功能：表示从过去某时看将来某时正在进行的动作。
He asked me what I should be doing when he came the next day.
