I was reading a grammar book, and I stumbled across the following sentence

> 君になんかわからない

At first sight, I thought it means "I don't know you." But the translation
given beneath the sentence is "You don't know."

The subject of the sentence is totally different. In my previous experience, に
is always used for object mark as in "彼女に会いたい”, in which に is used for
indicating a receiver of the action.

So I gone to look up dictionary, and it does mentions some circumstance where
に is used as a subject mark, but it doesn't give details. So can anybody
clarify this usage or can provide some reference?
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grammar meaning particle-に
when is に used to mark the subject?
Various verbs like わかる and できる historically describe the quality of a thing.
わかる is perhaps better thought of as _" to be understandable"_. In this case,
the noun marked with に is the thing **by which** the subject of わかる _" is
understandable"_.

In your sample sentence, the subject is omitted (implied), and is presumably
whatever the speaker was talking about. This subject _" is not understandable
**by** you"_. This becomes _" you don't know"_, with "you" as the subject,
only in translation -- grammatically, in the Japanese, 君【きみ】 ("you") is not
the subject.
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answer
に is not always only used to mark an object. It is helpful to also further
distinguish between between a "direct object" (usually marked with を) and an
"indirect object" (usually marked with に or と).

> used as a subject mark

Mutsuko Endo Hudson in [English Grammar for Students of
Japanese](https://www.google.com/books/edition/English_Grammar_for_Students_of_Japanese/ECmCFBtvvkcC)
describes a subject as:

> In a sentence describing an action, the person or thing that performs the
> action is called the **subject**. When you wish to find the subject of the
> sentence, look for the verb first; then ask, _who?_ or _what?_ before the
> verb. The answer will be the subject.

In many Japanese clauses, you'll need to infer the subject, because it isn't
explicitly stated in the text or speech alone.

に has several functions, and its function depends on the particular verb that
に is used with.

Makino and Tsutsui in [A Dictionary of Basic Japanese
Grammar](https://www.google.com/books/edition/%E6%97%A5%E6%9C%AC%E8%AA%9E%E5%9F%BA%E6%9C%AC%E6%96%87%E6%B3%95%E8%BE%9E%E5%85%B8/3wMrAQAAIAAJ)
lists the elementary and most common usages of に:

  * point of time at which something takes place
  * indirect object marker
  * agent or source in passive, causative and other receiving constructions
  * surface marker
  * purpose when someone moves from one place to another
  * location where someone or something exists
  * place toward which someone or something moves

However, don't be misled into thinking that this list is exhaustive. に appears
in many other patterns and its usage will differ from pattern to pattern.

Group Jamassy in [A Handbook of Japanese Grammar Patterns for Teachers and
Learners](https://www.9640.jp/nihongo/ja/detail/?678) lists about 70 different
grammar patterns using に and a particular verb or inflection of a verb. Some
of those に patterns have a component marked by に, where that component also
is, coincidentally, the subject. But some of those に patterns _do not_ have a
component that is coincidentally also the subject.

For example, on page 460 of [A Handbook of Japanese Grammar Patterns for
Teachers and Learners](https://www.9640.jp/nihongo/ja/detail/?678), in the
pattern Nにかかっては, they show this example sentence and its English translation:

>   3. 彼女にかかってはいつもしらないうちにイエスと言わされてしまう。/ She always makes me say _yes_ without
> my noticing it.
>

Here, 彼女 (she) is marked by に, but 彼女 is also the subject because "she" is
performing the action.

Breaking it up for clarity and understanding:

```

    彼女 (she) 
    にかかっては (no one can match her behavior)
    いつも (always)
    しらないうちに (without noticing) 
        しらない (to not notice)
        うちに (at a time within) 
    イエスと (say yes)
    言わされてしまう (force me to say, regrettably)
    
```

Group Jamassy's explanation of にかかっては, also from page 460:

> With a noun expressing a person or behavior, にかかっては indicates the person or
> the behavior, followed by an expression to mean that no one can match
> him/her or his/her behavior including what s/he said.
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answer