改错:He would never do anything that would make her unhappy.
改法之一:He would never do anything that may/might make her unhappy.
【补充】是的,同意王老师的看法。
would never do...可以表示现在的一种“意愿”,也可以是过去将来时态或过去的一种习惯动作。我是根据第一用法改的。
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还有一种情况:如果would表示过去将来或过去的一种习惯,that后的would要去掉,直接用过去式made。