I thought of him, nor did I forget you.
我牢牢记住了一条语法规则：nor引起的分句只能用在另一个否定分句之后。例如：
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He never went again, nor did he write to apologize. 他再也没去，也没有写信道歉。
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Dumbledore had never revealed that he had replaced the sword with a fake, nor had he so much as mentioned a friendship with Bathilda. (J. K. Rowling, Harry Potter and the Deathly Hallows) 邓布利多从来没表现出他会在原处放一把假剑，更没有提到过与巴斯尔达的友谊。（《哈利·波特与死亡圣徒》）
但是,我所提出的句子却是 nor 分句用在肯定句之后。这是怎么回事呢?
根据现代英语惯用法，在正式的语体里，即使第一个分句是肯定句，也可以使用 nor:
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We have many enemies; nor can we be sure of all our friends. (AED) 我们有许多敌人；对我们的朋友也不能全都相信。
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All the students were obviously very miserable. Nor were the teachers satisfied with the conditions at the school. (CGEL) 所有的学生显然都很忧伤,教师也不满意学校的状况。
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This unique product carries a brand name that represents an entire country; nor is this an accident. [ = "and this is no accident" ] (CGEL) 这种无与伦比的产品拥有代表全国的牌号；而这绝不是偶然的。
在句(1-2)中第一个分句具有含蓄的否定的含义,而在句(3)中第一个分句则毫无否定含义。后一用法仅限于庄重的正式语体。