分析几个英文句子的语法成分,
1.The ban was adopted after federal investigators announced that they were looking at the role that a train engineer’s text-messaging might have played here last week in the country’s most deadly rail accident in four decades.（第二个that引导的是什么从句）
2.Four councilors have already been given iPads,each costing around £700,as a trial.
3.I wanted people to have witnessed that small act of kindness not so that I would receive credit and praise but so that they might be inspired to do the same and in so doing that others still would witness their acts of kindness.
4.Suddenly,with a desperate look,a woman crying,her face went with tears,approached me.She was half hysterical which scared me a bi.I managed to calm her down and asked what the problem was.