1.He has not yet returned.He is returning in ten minutes.
有时候be doing表与现在在时间上非常接近的将来
2.A new play is being set at the Globe Theatre.
set过去分词为set
3.When the concert ended,we set home.
set过去式为set,表示出发
4.They will set very early tomorrow morning.
理由同上
5.You can't take the exam yet.You are not set of it.
set有形容词词义“做好准备的”
6.He will be set from home for two hours.
理由同4
7.She swam across the English Channel and set a new world record.
set a record,建立一个记录,即打破了世界记录,是一个固定词组