1、過去某時正發(fā)生的事情
What were you doing yesterday at seven p. m. ?
2、在一個句子里，過去進行時常與一般過去時連用，此時，進行時表示較長的正在進行的動作，而一般時表示較短暫的動作或事情
The phone rang while I was having my bath.
When she arrived, I was telephoning Harry.
When she arrived, I telephoned Harry. (到后做)
The reporter said that the UFO was traveling to west when he saw it.
3、可用while強調同時進行的兩種或幾種動作
While I was working in the garden, my wife was cooking dinner.
What were you doing yesterday at seven p. m. ?
2、在一個句子里，過去進行時常與一般過去時連用，此時，進行時表示較長的正在進行的動作，而一般時表示較短暫的動作或事情
The phone rang while I was having my bath.
When she arrived, I was telephoning Harry.
When she arrived, I telephoned Harry. (到后做)
The reporter said that the UFO was traveling to west when he saw it.
3、可用while強調同時進行的兩種或幾種動作
While I was working in the garden, my wife was cooking dinner.