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First and foremost, I am a beginner, and I have just started studying
Japanese. At my university we use Shokyu Nihongo 1 as the main student, so
let's get to the point. In chapter 2 there are rules about adjectives. Thus
far I understand the order of adjectives:

  1. Noun は Adjective (い-adj or な-adj) です
  2. Adjective (い-adj or な-adj) Noun は です

> 富士山は高い山です。

However I don't understand the difference between rule #2 and #3

**The rule #3 is as follows: Adjective (い-adj or な-adj) Noun は ~ です**

> e.g. そのあかいかみはしょっけんですか。いいえ、このあかいかみはしょっけんではありません。

In my book rules #2 and #3 are the same, however, I may not see the difference
so I would be glad for the explanation of rule #3
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90334
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question
adjectives
Adjective rules
There are several things potentially going on here there are confusing you.

The first that comes to mind is a grammatical point being somewhat obscured by
the use of _formal_ structures.

To me, it looks like there are three different types of sentences you're
learning to express here.

  1. **Noun Phrase** is **Adjective**
  2. It is **Noun Phrase**.
  3. **Noun Phrase** is **Noun Phrase**

These would correspond to the following three rules for Japanese

  1. Noun は Adjective (い-adj or な-adj) です
  2. Adjective (い-adj or な-adj) Noun です (Notice this differs from your rule 2)
  3. Adjective (い-adj or な-adj) Noun は [Noun Phrase] です

These are expressing three rather different ideas.

Examples first in English.

  1. The red book is expensive.
  2. It is a tall mountain.
  3. The young woman is a student.

In Japanese, using plain forms (which you may not have learned yet), these
would be expressed as

  1. [赤]{あか}い[本]{ほん}は[高]{たか}い
  2. [高]{たか}い[山]{やま}だ
  3. [若]{わか}い[女]{おんな}は[学生]{がくせい}だ

To move these into a more formal register, you would change them as follows.

  * For sentences ending in an い-adjective, the sentence is made formal by adding です
  * For sentences ending in だ, change だ to です

So, applying these to the three sentences above (to make them formal), you get

  1. [赤]{あか}い[本]{ほん}は[高]{たか}いです
  2. [高]{たか}い[山]{やま}です
  3. [若]{わか}い[女]{おんな}は[学生]{がくせい}です

There is no Japanese grammatical structure that is composed as

  * < _Noun phrase_ >はです。

If you're starting with < _Noun phrase_ >は and ending with です then between the
two you need to be saying something about < _Noun phrase_ >.

So, it's ungrammatical to say

> あかいほんはです

> The read book is .... < _what? you haven't said_ >

But you can say

> あかいほんです

> It's a red book.

You can also say

> あかいほんはこれです

> The red book is this.

# Conclusion

I suspect that the there is a typo in your rule two. It should perhaps read

  2. Adjective (い-adj or な-adj) Noun です

Notice the omission of the particle は.
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answer