Question

英语语法高手请进

Police relased the video footage showing a old man burst into a hostpital and attack the workers with a metal bar, leaving four medical workers injured.

这里的showing应该表示a old man...bar，那为什么使用了burst和attack是现在的时态，整个事情导致了leaving four medical workers injured. 那这里使用的leaving，v+ing，这算是结果状语吗？是应该理解
整个事情(a old man burst into a hostpital and attack the workers with a metal bar)（It）left four medical workers injured.

Answer 1

你的疑问有道理
本句与现在时无关
这里的showing是现在分词作定语修饰the video footage 与所修饰词是主动关系 故用现在分词
后面是现在分词的宾语从句 应该是过去时 如果是现在时 动词应该加s
所以原句应该是showing （that）a old man burst into a hostpital and attacked the workers
burst的过去式还是 burst
相当于一个定语从句=which showed（that) a old man burst into a hostpital andattacked the workers
整个事情导致了leaving four medical workers injured. 这里使用的leaving，是宾语从句中结果状语 与宾语从句中的主语 是主动关系 故用现在分词
是应该理解
a old man burst into a hostpital and attacked the workers with a metal bar and left four medical workers injured.

Answer 2

Police relased the video footage （showing a old man burst into a hostpital and attack the workers with a metal bar, leaving four medical workers injured）.
括号部分（现在分词短语）做the video footage 的后置定语，所以用一般现在时。用汉语理解下，警察调录像，录像显示……
显示的当然是现在时了。

追问

那一般Showing后跟着的后置定语，需要使用现在时态？还有，leaving four medical workers injured 跟前部分，怎么分析句型呢？（It）left four medical workers injured. 是这么看吗？

追答

第一个问题不是绝对的，要结合实际情况。
leaving four medical workers injured
现在分词短语做结果状语,另外，injured是做宾补。
总的来说，你的这个句子涵盖好多语法，不用急于都领会。