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求英语高手,句子成分不明

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求英语高手,句子成分不明
David Douglas,Scottish botanical explorer of the 1830s.Found a disturbing change in the animal life around the fort during the period between his first visit in 1825 and his final contact with the fort in 1832.
①.第一句话怎么分析,没有谓语动词啊,就算是说这个人也应该是David Douglas is a Scottish botanical explorer of the 1830s呀,
②.Found开头的第二句话主语是省略了吗?是什么句式,found是谓语动词吗?这是个什么句子?为什么开头就是谓语动词而且不用ing形式?
③.In the animal life
④.Around the fort 是地点状语吗?
⑤.During the period between his first visit in 1825 and his final contact with the fort in 1832 是时间状语吗?
这应该是一整个句子,Found前应是逗号
a disturbing change 是宾语
in the animal life around the fort 是宾补,共同描述change
during the period between his first visit in 1825 and his final contact with the fort in 1832是时间状语
再问: 那这样的话,这个句子变成 David Douglas, Scottish botanical explorer of the 1830s, found a disturbing change in the animal life around the fort during the period between his first visit in 1825 and his final contact with the fort in 1832 这样的话,Scottish botanical explorer of the 1830s这句话是插入语吗?还是定语?还是主补?如何区别的?
再答: 插入语,因为用逗号隔开了。定语的话会用从句表示,如:David Douglas who is a Scottish botanical explorer of the 1830s。因为是补充对主语的说明,也可以称为主补。
再问: 那就是说在这个地方,插入语就是主补?可是没有插入语做主补这种语法啊?
再答: 可以的,没那么严格。