1. In no way; to no degree. Used to express negation, denial, refusal, or prohibition:
I will not go. You may not have any.
2. Middle English
4. Care should be taken with the placement of not and other negatives in a sentence in order to avoid ambiguity. All elephants are not friendly could be taken to mean either “All elephants are unfriendly” or “Not all elephants are friendly.” Similarly, the sentence Kim didn't sleep until noon could mean either “Kim went to sleep at noon” or “Kim got up before noon.” · In formal writing the not only . . . but also construction should be used in such a way that each of its elements is followed by a construction of the same type. Instead of She not only bought a new car but a new lawnmower, write She bought not only a new car but a new lawnmower; in the second version, both not only and but also are followed by noun phrases. · In the not only construction also is often omitted when the second part of the sentence merely intensifies the first:
为避免意思模糊，在句中放置not 和其他否定词时必须小心： All elephants are not friendly 可被理解为“所有的大象都不友好”或“并不是所有的大象都友好”。 与此相似，句子Kim didn't sleep until noon 即可以被理解为“科姆中午去睡觉”或“科姆中午前起床”。 在正式写作中,not only…but also 结构应这样用： 每一个成分后都跟一个相同形式的结构。应把She not only bought a new car but a new lawnmower 写成 She bought not only a new car but a new lawnmower； 在第二个句子里，not only 和 but also 后都跟名词短语。 当第二部分只是强调第一部分时，在not only 结构里 also 通常省略：
She is not only smart but brilliant.