be convinced that ... 可能是被动语态，也可能是系表结构。

及物动词convince意为是某人相信某事是真实的，to cause (someone) to believe that something is true 常用的句型为：

convince sb of sth, convince sb that 从句。如下面词典例句：

They convinced us of their innocence.

He convinced me that the story was true. that从句为直接宾语。

注意词典例句中的谓语动词为过去时态。为什么例句不用一般现在时呢？因为使人相信这个动作并不是习惯性动作，也不大可能在说话人说话时正好发生，所以无法用一般现在时表示这个动作。使人相信这个动词通常都是发生在说话人说话时之前的，所以主动语态的句子中谓语动词通常都是一般过去时或现在完成时。如果我们把上述第二个例句改为被动语态，则还是表示过去的动作：

I was convinced (by him) that the story was true. (by him这个实施者状语通常被省略）这个句子就是被动语态。that从句为保留宾语。

convince的动词发生后，作为其宾语的某人就处于被使得确信（即自己确信了)某事的状态中, 因此convinced这个过去分词就可以演变为表示这种状态的形容词。词典已经收录了convinced作为形容词的词典。例如《韦氏高阶》convinced作为形容词的释义为：completely certain or sure about something。词典例句如下：

You still don't sound convinced.

She's still convinced that we're wrong.

第一个例句告诉我们convinced是个形容词作表语。注意第二个例句be为现在时，表示说话人说话时（现在）主语的状态，即句子为系表结构。尤其still这个状语更加说明这个状态在现在仍然存在，而不是表示使相信这个动作仍然在发生。此时that从句不再是保留宾语，而是而是表语形容词的补足语。

从以上分析可知，be convinced + that从句可能是系表结构，也可能是被动语态。如果be是现在时，则通常应该分析为系表结构表示主语的状态。如果be是过去时，则句子可能是系表结构表示主语在过去某个时候的状态，也可能是被动语态表示使相信这个动作发生在过去某个时候。这就需要根据上下文语境去判断说话人是在表示主语的过去的状态还是表示过去发生的动作。

现代英语的发展趋势是某些过去分词形容词化，convinced 就应该算一个。请看朗文词典的解释：https://www.ldoceonline.com/dictionary/convinced

con‧vinced /kənˈvɪnst/ ●●○ AWL adjective    1 [not before noun] feeling certain that something is true 

Molly agreed, but she did not sound very convinced.

be convinced (that) I was convinced that we were doing the right thing.

《剑桥词典》https://dictionary.cambridge.org/dictionary/english/convinced

adjective [ + (that) ] I'm convinced (that) she is lying. 

be convinced that..被朗文，剑桥等词典列在convinced作为形容词的词条下。The free dictionary也有相同解释和例句。国内学英语的人多习惯于接受传统的convinced 为过去分词的观点。

此处的 be convinced 应该看作convince的被动式。

动词convince: to make someone feel certain that something is true：

它的主动式是这样的：

convince somebody (that)

Baker had to convince jurors that his client had been nowhere near the scene of the murder.

convince somebody of something

The officials were eager to convince us of the safety of the nuclear reactors.

因此，没有将be convinced that当做形容词结构的理由。

在搭配be convinced that中，是把它看成be done被动形式呢?还是像afraid一样，be afraid that，把convinced当做形容词呢?

网友提出问题应该具体问题具体分析。因为convinced 既可能使“形容词表示状态” 也可能使“被动语态过去分词表示动作” 如果使表示状态就可以理解为“形容词” sb be convinced that;  如果使表示动作，可以理解“被动语态里过去分词”结构A be convinced that by B ;  A be convinced of sth by B;  A be convinced to do sth by B

【一】convince  vt. 使确信；使相信；使信服

【1】主动结构：主语+convince +名词/代词+ of +名词 使..相信某事

You'll need to convince them of your enthusiasm for the job.

你要使他们相信你殷切希望得到这份工作。

Although I soon convinced him of my innocence, I think he still has serious doubts about my sanity.

虽然我很快便让他相信我是清白的，但是我想他仍然非常怀疑我是否神志正常。

【2】被动结构：主语+be convinced + of +名词 某人相信某事

On closer investigation you will be convinced of his dishonesty.  一经仔细调查,你就会相信他的不诚实.

【3】主语+convince +名词/代词/反身代词+that 使...确信/相信

 The waste disposal industry is finding it difficult to convince the public that its operations are safe.  

废物处理行业发现很难让公众相信其操作是安全的。

I had convinced myself that I was right.我确信自己是正确的。

【4】主语+convince+名词/代词/反身代词+to do sth说服/劝服某人做某事。

I've been trying to convince him to see a doctor.我一直劝他去看病。

That weekend in Plattsburgh, he convinced her to go ahead and marry Bud.  在普拉茨堡的那个周末，他说服她嫁给巴德。

【二】convince  adj.  坚信的，确信的;相信的;深信的

【1】主语 +be convinced of +名词

I am convinced of her innocence.我坚信她是清白无辜的。

He became convinced of the need for cheap editions of good quality writing.他开始相信大众对优秀作品的普及本有需求。

【2】主语 +be convinced +that从句

He was convinced that I was part of the problem.他确信我就是问题的一部分。

I am convinced that she is innocent.我坚信她是清白无辜的。

【3】主语 +look+ convinced

Sam nodded but he didn't look convinced.萨姆点了点头，可他看起来并没有信服。

总结：通过以上观察，表示动作的“主动语态结构”都是“动词用法”表示状态的“被动结构”都是“形容词用法”。的“被动结构”都是“形容词用法”。