题目内容
自动闭塞区间通过信号机显示红色灯光，司机停车，当前方闭塞分区有车时可以动车，但是速度不能过高。
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司机发现火炬火光停车后，应报告车站值班员，请求救援。
Analyze the following sentences to see what tenses they belong to.Note: P stands for the simple past tense and PP for the present perfect tense.1) I’ve only been here for ten minutes or so.
2) Ted has always worked in an accounting department.
3) Mark has worked for this large company for many years.
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