英语写作中的no和not的六大使用规则

在英语写作中要用到no和not时，一般要遵循以下六个规则：

规则1：“No+名词”意思与“not+a/the+名词”意思相似。没有“Not+名词”这一用法。我们不能说：We have not reason to suppose that。

例如：

There is no reason to suppose that…=there is not a reason to suppose that …

规则2： “No+名词”通常通常可以用“not+动词+any+名词”替换。

例如：

We encountered no problems with the calculations= we did not encounter any problems with the calculations.

规则3： be后面的形容词如果没有加名词，则前面加not；如果后面有名词，则要用no。

例如：

It is not unusual to find strange species in this area.

There are no unusual species in this area.

规则4： 副词前要使用not：

例如：

Not surprisingly, the cardiovascular system is the first organ system to reach a functional state in an embryo.

规则5：No longer可以写成较不正式的not…any more/longer。

例如：

This system is no longer used.

This system is not used any more.

This system is not used any longer.

三句话意思一样。

规则6：“No+形容词比较级”表示相比较的两个事物是相同的，例如A is no bigger than B, 表示A并不比B大。

比较下面两个例句：

X turns out to be no easier than Y. (言外之意： X and Y have the same level of difficulty)

X is not easier to solve than Y. (言外之意：Y is probably easier to solve than X)