the experts were now fully convinced that the animal was a puma.后面的从句为什么was啊?虚拟语气么

The experts were now fully convinced 句中为何加were 做什么成分 新概念3第一课中有句话不明白,the experts were now fully...为什么now可以用于一般过去时?好纠结啊原句是 the experts were now fully convinced taht the animal was a puma.是第一课的 the experts were now fully convinced that the animal was a puma.这是定语从句还是状语从句啊? the experts were now fully convinced that the animal was a puma.后面的从句为什么was啊?虚拟语气么 英语提问：副词在以下句子中的位置能否进行如下调整.原句：Now experts were sure that the animal really was a tiger.改句1：Experts were now sure that the animal was really a tiger.(now,really均放be动词之后）改句2： 英语提问：以下句子中的副词可以进行如下位置变换吗?原句：Now experts were sure that the animal really was a tiger.改句1：Experts were now sure that the animal was really a tiger.(now,really均放be动词之后）改句2： experts were convinced that the animal was a puma.experts were convinced 是被动么?that 后面 是 什么从句? the experts were now fully convinced that the animal ___a puma1 must be 2 should have been 3 can only be 4 could only have been请问选择哪一个,及分别说出每个为什么对与错课文里面有一句话The experts were fully convinced that by now 的用法The experts were now fully convinced that the animal was a puma .这句话中NOW ,事情发生在过去,.After acrossing the Equator ,the caption called in at a portto have a now rudder fitted.but by now the Thermopylae was over fiveh 英语翻译The upside is the possibilities contained in knowing that everything is up to us; where before we were experts in the array of limitations,now we become authorities of what is possible. 句子结构The experts were now fully convinced that the animals was a puma后面的that引导的是一个宾语从句还是that 仅仅作为一个连接词呢 新概念上的一道选择题The experts were now fully convinced that the animal_______a puma.A.must be B.should have been C.can only be D.could only have been可能是多项选择,是A和D么 Were the experts sure that the animal was a puma?Why? were you in the supermarket just now? 英语提问：句子结构分析,急!What was the problem the experts were unable to solve?麻烦详细点,新手. 新概念英语中的几个问题~第三册中有这个题目：The experts were now fully convinced that the animal ____ a puma A.must be B.should have seen C.can only be D.could only have been.我选择是是A 但答案是D为什么啊还有个.The the experts were now fully convinced that the animal was a puma,but where had it come from?As no pumas had been reported missing form any zoo in the countrybut where had it come from?这里的had为什么要用过去完成时呢 ,而且come from这 1 （）,it immediately ran away.a.Observing her b.On being oberved c.Having been oberved d.On her being oberverd2 The experts were now fully convinced that the animal ( ) a puma.a.must be b.should have been c.can only be d.could only have been