新概念3课文中的问题疑问1：有一句：Thesearchproveddifficult,forthepumanwasoftenobservedatoneplaceinthemoringandatanotherplacetwentymilesaway.“,为什么proved前面没有was啊?search应该是被证明啊,被动

Question

新概念3课文中的问题
疑问1：有一句：The search proved difficult,for the puman was often observed at one place in the moring and at another place twenty miles away.“,为什么proved前面没有was啊?search应该是被证明啊,被动语态应该加was啊?
疑问2：Paw prings were seen in a number of places and puma fur was found clinging to bushes.此句中,我很不理解那个clinging是怎么回事?为什么是-ing形式啊?
疑问3：The expert were now fully convinced that the animal was a puma,but where had it come from?我想问一下这里的convinced是不是和were构成了被动语态啊?后面那一小句中where had it come from中had it是什么用法和意思?
疑问4：As no puma had been reported missing from any zoo in the contury.句中这个missing为什么是-ing 形式?
thanks a lot!

Answer 1

Q2:be found doing,固定模式 具体语法现象名称我不记得了.
be reported doing 也是一样的
Q3：你的推测正确；had 是来自过去完成时,跟where did it come from 是一样的,就时态不同而已.
Q1：我回答不上来,search是名词,接下来你就自己悟吧!