学生问：什么叫简单相加变从句？
Tyger举例说明。
1.When the plane arrived, some of the detectives were waiting inside the main building while others were waiting on the airfield.
简单句1：The plane arrived.
简单句2：Some of the detectives were waiting inside the main building.
简单句3：Others were waiting on the airfield.
连词1：when
连词2：while
2.While two detectives were keeping guard at the door, two others opened the parcel.
简单句1：Two detectives were keeping guard at the door
简单句2：Two others opened the parcel.
连词：while
3.The plane was late and detectives were waiting at the airport all morning.
简单句1：The plane was late.
简单句2：Detectives were waiting at the airport all morning.
连词：and
4.A few hours earlier, someone had told the police that thieves would try to steal the diamonds.
简单句1：A few hours earlier, someone had told the police.
简单句2：Thieves would try to steal the diamonds.
连词：that
5.I had just lost $50 and I felt very upset.
简单句1：I had just lost $50.
简单句2：I felt very upset.
连词：and
6.The manager was sympathetic, but he could do nothing.
简单句1：The manager was sympathetic.
简单句2：He could do nothing.
连词：but
