为什么有的谓语动词前面加be动词 有的不加 排除被动语态 比如 we are convinced that… a gir

1.convince sb. of sth.
2.convince that...和宾语从句搭配,
没有宾语时采用主系表结构：be convinced,
然后紧接着举了个例子,说道：“The experts from the zoo were convinced that the animal was a puma.专家们相信了那个动物就是一只美洲豹.只是强调了专家们相信了,并没说使谁相信. 我相信她是一个城市的女孩,I'm convinced that she is a honest girl.所以没有宾语的情况下要采用主系表结构.”