Many kinds of animals are believed to have disappeared from the earth. 用to disappear 也可以啊。

Many kinds of animals are believed to have disappeared from the earth. 用to disappear 也可以啊。表示将要

这里所说的Many kinds of animals 已经是灭绝的动物了,故用不定式完成形式的 to have disappeared 来表达动作先发于are believed所表明的时间,而to disappear则指将来。
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