The context of my question is the usage of a grammar point from a JLPT 文法
textbook. It is not the grammar point itself that I am asking about, but
rather the grammar used to explain the grammar point. Sorry for this
complexity.

The textbook explains how to form sentences using the pattern 「〜（の）なら...」:

> 普通形（ナ形 ~~だ~~ ／-である・名 ~~だ~~ ／-である）＋（の）なら  
>  ナ形 ~~だ~~ 、名 ~~だ~~ の場合は「のなら」 **にはならない**

(Basically, the second line is saying that if ~ is a na-adjective or a noun,
for instance 雨, one can have 雨なら, or 雨であるなら, or 雨であるのなら, but NOT 雨 **の** なら.)

**My question is this.** How to break down the にはならない in bold font in the
second line above? I think it could be one (or neither) of the following
possibilities:

  1. Is it just the negative of ...になる, with は in にはならない being there for emphasis? If so, what exactly does になる mean in this context? To become? To be?
  2. Alternatively, does ならない here mean "must not"? If so, what exactly is the usage of には here?
CC BY-SA 4.0
2020-08-31T13:16:59.873
80423
2022-03-06T06:26:53.290
2022-03-06T06:26:53.290
30454
38770
question
particles particle-に grammar
Break down ... にはならない