Too late
1, 过去进行时 （常搭配 when / while / as ）
2，述句变宾语从句 （that 因电脑）
3, 过去将来时
The plane was late and detecitives where waiting at the airport all morning.
They were expecting a valuable parcel of diamonds from South Africa.
过去进行时
was/were doing 否定： She was not reading a book … 疑问： Was she reading a book … ?
A few hours earlier, somenoe had told the police that thieves would try to steal the diamonds.
过去完成时 过去将来时 would do … was / were going to do …
宾语从句
You are right.
I think ___.
I think that you are right // 陈述句直接变宾语从句， 前加 that， 并且可以省略。
When the plane arrived, some of the detectives were waiting inside the main building while others were waiting on th e airfield.
When // 当什么时候
while //
as
Two men took the parcel off the plane and carried it into the Customs House.
take off
While two detectives were keeping guard at the door, two others opened the aprcel.
To their surprise, the precious parcel was full of stones and sand .
过去进行时 （常搭配 when / while / as )
while , as 通常搭配延续性动词， 搭配进行事态。
When 没有上面的限制。
过去进行时 （当） 铺陈故事背景, 一般过去时讲述故事。