时间状语从句用when · while · as · 引导的句子 造句,

1.When my husband was going in to the dining room,he dropped some coins on the floor.
（当我的丈夫正走进餐厅的时候,他掉了一些硬币在地上.）
2.While we were having breakfast,our little baby was playing with the pet dog.
（当我们正在吃早餐的时候,我们的小孩子正在和宠物狗一起玩.）
3.As I arrived at the train station,the train has left.
（我到火车站的时候,火车已经开走了.）