A wet night新概念两篇课文都有点小疑惑、

A wet night新概念两篇课文都有点小疑惑、
Late in the afternoon,the boys put up their tent in the middle of a field.As soon as this was done,they cooked a meal over an open fire.They were all hungry and the food smelt good.After a wonderful meal,they told stories and sang songs by the camp fire.But some time later it began to rain.The boys felt tired so they pet out the fire and crept into their tent.Their sleeping-bags were warm and comfortable,so they all slept soundly.In the middle of the night,two boys woke up and began shouting.The tent was full of water!They all leapt out of their sleeping-bags and hurried outside.It was raining heavily and they found that a stream had formed in the field.The stream wound its way across the field and then flowed right under their tent!
【As soon as this was done,they cooked a meal over an open fire.】为什么前一句的时态没有用过去完成时?
I had an amusing experience last year.After I had left a small village in the south of France,I drove on to the next town.On the way,a young man waved to me.I stopped and he asked me for a lift.As soon as he had got into the car,I said good morning to him in French and he replied in the same language.Apart from a few words,I do not know any French at all.Neither of us spoke during the journey.I had nearly reached the town,when the young man suddenly said,very slowly,'Do you speak English?' As I soon learnt,he was English himself!
【 As soon as he had got into the car,I said good morning to him in French and he replied in the same language.】这里前一句用的是过去完成时.