Question

高二英语必修5人教版Unit5课文请教

It was John's quick action and knowledge of first aid that saved Ms Slade's life.He immediately asked a number of nearby people for bandages,but when nobody could put their hands on any,his father got some tea towels and tape from their house.John used these to treat the most severe injuries to Ms Slade's hands.He slowed the bleeding by applying pressure to the wounds until the police and ambulance arrived.
这是Unit5里的一篇课文，明天会上去给同学们讲解，请问一下该怎么讲，就是这里面有些什么句型啊，单词的形式之类的要注意的，麻烦请指点一下，谢谢

Answer 1

It was＋被强调部分＋that 强调句， John's quick action and knowledge of first aid是被强调部分，
but when nobody…，when表示当…的时候，时间状语从句
by applying pressure to the wounds …,by引导的方式状语，其他的就不太清楚了，你查一下参考书吧

追问

but when nobody…，when表示当…的时候，时间状语从句 它引导的是哪个句子啊？