We took the school bus when started at 7:20我想问一下这里为什么不用when用

We took the school bus when started at 7:20我想问一下这里为什么不用when用 英语翻译We started school in Bedford when our families moved the 当公交车上全是人时. When a bus is full of people. 为什么这里用is不用are The 38 started when what did he see when he went into the office?这里为什么用when而不用别的 When I see the envelope from school in the mail 中为什么用see 而不用 When the school basketball competition started,Kate was stil the children ( ) on the playground when l left school 为什么用we when we hurried to the station,there happened __no bus at th When he arrived at the bus stop,the bus ( )for 20 minutes?A. I __ at the bus stopfor 20 minutes when the bus finally came We took many p___ when we visited the Great Wall