同学你好，该知识点来自沪江网校《2021考研公共课名师全程班【英语二】（屠皓民名师团队）》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

 Research on animal intelligence also makes us wonder// what experiments (animals would perform on humans)// if they had the chance.本句是if引导的虚拟条件句，与现在事实相反。从句if they had the chance用的过去时，主句Research on animal intelligence also makes us wonder what experiments animals would perform on humans...用的是would+do的形式。主句中主语是 Research on animal intelligence，谓语是makes，what experiments animals would perform on humans是宾语从句,由what引导。宾语从句是要遵循陈述句主谓宾的结构。但是在句子中又有animals 开头为定语从句，引导词 that 被省略。所以，experiments只能放在what后面，具体可以结合翻译。what experiments animal could perform  on humans if they had the chance.动物会对人类做什么实验。//what animal could perform experiments on humans if they had the chance.什么动物可以在人类身上做实验。明显experiments只能放在what后面，放在perform后面，句子成分/意思完全改变，变得不合理。