Unfortunately, he took some medicine which was har

有的答案中提示去掉which was ，那么medicine和harmful之间是主动还是被动的关系。

Unfortunately, he took some medicine which was harmful to his lungs/heart.

【翻译】不幸的是，他服用了一些对他的肺部/心脏有害的药物。

从网友的提问看，似乎是不要which was，变成形容词短语作定语。

其实，保留which was 是定语从句，同样正确。

was harmful to 不存在“主动被动”问题。这是一个系表结构，不是及物动词。

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陈才 - 英语教师 1秒前

擅长：中考英语,词法问题

Unfortunately, he took some medicine which was harmful

which was harmful为定语从句修饰前面的名词“medicine”