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On a [separate question about Japanese
pitch](https://japanese.stackexchange.com/questions/11106/why-do-english-
sources-for-learning-japanese-leave-out-pitch), one of the examples I left
was:

> '甘美（うまみ）の花は赤を見える' (Your flower looks red [talking to Umami]).

One of the commenters claimed that it was grammatically incorrect and
Chocolate edited it to correct the mistake:

> '甘美（うまみ）の花は赤く見える'

I understand that certain verbs have different particles for different
contexts etc.

What is the purpose of く replacing を? Is く better, or is を also exceptable? If
so which is better and why? I apologise for the multitude of questions.
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grammar adverbs
Why is this sentence grammatically incorrect?
In Japanese language it is possible to use adjectives and their inflections in
order to have more structured and articulated sentences. In the specific case
you want to express a concept recalling the one when a certain object looks
like something else. When this happens, adjectives are involved.

## The correct way

The pattern for such a concept to be expressed is the following:

> (Noun)は|が(い->drop)く見える
>
> (Noun)は|が(な->drop)に見える

Remember always that when an adjective is to be turned into an adverb you need
to drop the い and put く (in case of い-adjectives), or drop な and put に in case
of な-adjectives. The case here is similar, because you need to turn the
adjective into an adverb and then apply 見える.

## The not (quite) correct way

You mentioned _Chocolate_. That user is a native Japanese speaker so please
listen to what she says because it is correct. In fact the sentence you
mentioned in the very first lines of your question is the following:

> 甘美{うまみ}の花は赤を見える

This sentence is not correct at all in my opinion. It all revolves around the
verb 見える. This verb can be interpreted in two ways:

  1. 見える as a "standalone" 一段{いちだん} verb.
  2. 見える as (one of) the (two possible) potential form(s) of 一段{いちだん} verb 見る{みる} (to see). It might sound like a 五段 verb but it is an 一段 instead, be careful.

The first verb acts the way I told you. Here you might tell me that in your
sentence there is no adjective (as you use 赤 and not the corresponding
adjective 赤い), well in that case it is treated as a な-adjective and you will
use the に as follows:

> 甘美{うまみ}の花は赤に見える

The pattern is the following (you can add this to the other two patterns I
mentioned before):

> (Noun)は|がに見える

The second verb is used in a potential context when you want to say that you
can see something. Unfortunately there is another potential form for the verb
見る but I will not detail it too much. Just now I am showing you how your
sentence is supposed to be changed in order to use such a verb (and how the
meaning changes as well):

> 甘美{うまみ}の花が見える ==> I can see Umami's flower

## Conclusions

This is just to point that a verb like 見える can be used in two possible
contexts, but not one of them includes the possibility to use particle を! Hope
this helps you.
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> What is the purpose of く replacing を? Is く better, or is を also exceptable?
> If so which is better and why?

  1. In short, く does not replace を. They are different things: 

    * を is the direct object marker (accusative case marker)

    * ～く is the adverb declension of an adjective ～い.

  2. **The verb 見える does not assign a role for a direct object** , hence [noun]を does not relate to the verb 見える. く isn't better than を, there is no scale for comparison.

  3. **Adverbs modify verbs**. The main verb is 見える, the manner in which it does 見える is 赤く. Therefore 赤く見える - "looks red"

* * *

For the case of ~を見えるようにする presented by yadokari:

  * する assigns a direct object role `~を`, and a relational object role `~に`

  * It is ~をする, and the objective to which it is done is 見えるように.
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