如果只写it is+名词，句子的结构就比较单调，如果我们把is的写法替换为一些被动结构，效果也不一样，具体的方法如下：

1）It is nothing but+名词

2）It has been well received as+形容词的最高级+名词

3）It is been commonly accepted as one of +形容词最高级+名词s

4）It is considered+名词

5）It can be regarded as+名词

6）It can be seen as +名词

以上其中句子结构，选取任何一种，解决it is 名词，结构简单，字数过少的问题。其中It is nothing more than和It is nothing but可以用于语气的增强，后面五种写法可以让主系表呈现出书面风格。我们可以通过对比，看一看写作的效果。

比如你想表达"英特网是一种娱乐方式"这个意思，如果不会使用句子结构，就只能写成It is a form of entertainment。但是如果选用上述句子结构，就可以分别写成It is nothing but a major means of entertainment. 或者Internet has been well received as the most popular means of entertainment，或者Internet has been commonly accepted as one of the most popular forms of entertainments。大家可以对比一下，这几个写法，是不是比it is a form of entertainment更像书面表达呢？
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