Most animals we commonly observe age as we do.
为什么observe是动词原形?不应该是过去分词的形式，作定语修饰animals吗？
这句子是这样的
Most animals （which）we commonly observe age as we do.
意思： 我们普遍观察的动物大多和我们一样会变老。
定语从句：（which）we commonly observe
主句：Most animals age as we do.
Most animals （which）we commonly observe age as we do.
意思： 我们普遍观察的动物大多和我们一样会变老。
定语从句：（which）we commonly observe
主句：Most animals age as we do.
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