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I've read a lot of mangas and I've noticed the use of **がいい** after a verb
e.g.

見る{みる}がいい。

諦めた{あきらめた}ほうがいい。

Does it work as an adverb?
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2016-07-17T01:50:01.493
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2016-07-19T05:21:10.780
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verbs imperatives role-language 連体形
The meaning of ～がいい
見るがいい。means "Why don't you take a look at it?"

見たほうがいい。means "You'd better take a look at it."

諦めるがいい。means "Just give up on it."

諦めたほうがいい。 means "You'd better give up on it."
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2016-07-17T10:29:47.207
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No, 見る and 諦めた方 are grammatically _subjects_ , not _adverbs_ in those
sentences. Words marked with が should be nouns, of course.

As you know, `noun + がいい` (lit. "～ is good", with exhaustive-listing _ga_ ) is
usually used when you choose one thing from a few possible options.

> 「ラーメンとカレー、どっちがいい？」「ラーメンがいい。」

If you want to use this with two or more possible actions (verbs), you
normally need a **nominalizer** , which can turn verbs into nouns:

> 「寝る **の** と遊びに行く **の** 、どっちがいい？」「寝る **の** がいい。」

Alternatively, you can use 方【ほう】, which is a **noun**. ほう literally means
something like "side", but it has many usages, including comparing two or more
options. See: [What is 方 used for (when attached to a
た-verb)?](https://japanese.stackexchange.com/q/6525/5010) and [This usage of 方
confuses me](https://japanese.stackexchange.com/q/15321/5010)

>   * 本を書く **ほう** がいい。 I like writing books (rather than doing something
> else). / You should write a book about it.
>   * ラーメン **のほう** がいい。 （≒ラーメンがいい）
>

* * *

What I've explained so far is about modern, standard Japanese grammar.
However, `dictionary-form + がいい` existed in classic Japanese, and is still in
use in some rare cases. This is one way of giving an order. (To be precise,
this verb form is
[連体形](https://en.wikipedia.org/wiki/Attributive_verb#Japanese), which was
slightly different from the dictionary form in classic Japanese) See:
[<動詞の辞書形> + がよい ― How is this
allowed?](https://japanese.stackexchange.com/q/6714/5010)

>   * 見るがいい！ (≒"Behold!")
>   * 諦めるがいい！
>

Note that this is a very pompous way of speaking, and no one speak like this
in real life. In manga, you would typically see this used by a noble princess,
old man, etc.

The negative counterpart is perhaps `dictionary-form + でない`. See: [何も言うでない !
meaning and origin](https://japanese.stackexchange.com/q/33807/5010)
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