Grammar Info

N5 Lesson 1: 9/12

()い-Adjective meaning 'good'

よく can also mean 'frequently/often', and has several different potential kanji

Structure

Non-Past Form: いい
Non-Past Negative Form: よくない
Past Form: よかった
Past Negative Form: よくなかった

Details

  • Part of Speech

    Adjective

  • Word Type

    Independent Word

  • Register

    Standard

About いい

いい is an adjective that means 'good' in Japanese. It can be a little bit difficult to use at first, as it conjugates differently to other い-Adjectives.

In these sentences, we can see that the first い in いい changes to よ, depending on the form. This is unique to いい, and does not happen with other adjectives.

いい can sometimes be seen as (), in these cases, the kanji is likely to be read as よい, and not いい. There is technically no difference between these two meanings, but よい does sound more formal/old-fashioned.

Caution

When used as an adverb, よく should not be confused as a conjugation of いい. よく has several possible kanji that it may stem from, and means frequently/often/well.

Examples

--:--

    いいです

    (It is) good.

    これいいです

    This is good.

    これいい(ほん)です

    This is a good book.

    これいい(ほん)です

    This is also a good book.

    これいい(おと)

    This is a good sound.

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        • Tae Kim's Japanese Grammar Guide

          Page 42

        • みんなの日本語 I

          Page 56 [CH 8]

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      いい – Grammar Discussion

      Most Recent Replies (17 in total)

      • Jake

        Jake

        adjective meaning 'good’

        Structure

        • Present: いい
        • Present Neg: よくない
        • Past: よかった
        • Past Neg: よくなかった

        View on Bunpro

      • CyanPlastic

        CyanPlastic

        Do the other forms besides present show up in reviews? Or do I have to make custom ones for that to happen?

      • mrnoone

        mrnoone

        There are sentences with non-past, past negative and past forms besides non-past(present)

      • drmoore718

        drmoore718

        For lessons like this, I think it would be nice to be tested on all the forms. Similar to wanikani where you have to get the reading and meaning correct to successfully complete the review.

      • mrnoone

        mrnoone

        Hey

        Using all the forms of grammar point and words that are often used together with it is one of the standards at Bunpro

      • Lilalas

        Lilalas

        Shouldn’t it accept よい as an alternative answer to いい ?

        I know the latter is more common, but よい is technically correct too, isn’t it?

      • mrnoone

        mrnoone

        Yes you are right!

        I will add it as an alternative answers right now!


        Edit:
        Added

      • JapanStar49

        JapanStar49

        So in other words, this lesson teaches the conjugation of https://www.wanikani.com/vocabulary/良い

        Why then does this come before the lesson on い-adjectives?

      • Ambo100

        Ambo100

        I think an important point to make is that some adjectives/expressions are conjugated like 良い because they are derived from two words together.

        かっこいい and 気持ちいい are two common examples where the past tense form would be かっこよかった and 気持ちよかった. Note that this doesn’t apply to かわいい because it doesn’t use the same kanji.

        Jisho.org actually has a list of ‘yoi/ii class’ adjectives.

      • nekoyama

        nekoyama

        The kanji for 可愛い are ateji anyway. The reason it doesn’t apply is that it’s not derived from 良い but from 顔 and 映し (かわはゆし ~ “red faced”).

      • lungmao3

        lungmao3

        Please can this Grammar point be added to the MNN1 path? (chapter 8 is mentioned in the resources) Thank you

      • ggenya

        ggenya

        A little confused on the conjugation of this topic.

        Does using ’いい’ require the the use of ’だ’ or ’です’?
        For example, I noticed in the first example we do in fact use ’だ’,
        eg,
        これはいい映画えいがだ
        However, the ‘だ’ is dropped in further examples that use the post form (positive and negative).

        So, is the conjugation imply the ‘is’ portion?
        Do we need to use "だ " in the present tense affirmative case? ,
        Eg, would これはいい映画えいが be a valid sentence (as opposed to これはいい映画えいがだ)

        Let me know if I’m thinking about this the right way or if may questions make sense.

        Thank you.

      • nekoyama

        nekoyama

        The だ in this sentence has nothing to do with the いい. The いい just modifies 映画 so we’re talking about a “good movie” instead of just a “movie”. You can treat いい映画 as a noun phrase, it could be replaced with anything else that can act as a noun (such as just 映画 by itself), and the rest of the sentence wouldn’t change. That there is a だ in this sentence is because it’s a typical AはBだ type of sentence.

        In many of the other examples, いい is the main clause’s predicate, e.g. これは良くない. In that case, adding だ is not grammatical.

        In the question sentences for this grammar point you’ll sometimes see です added after よくない or よかった etc. This is a special exception for です, where it doesn’t have a grammatical function, and only acts as a “politeness particle”. But this is only possible with です, we can’t use だ in those cases.

      • ggenya

        ggenya

        Thank you for clarifying that! です as a politeness article was throwing off my understanding.

      • whitewolfos111

        whitewolfos111

        Hello! I’m new here, so sorry if responding to this old thread isn’t the right thing to do when I have questions about a particular grammar discussion.

        I’m going through these grammar points for the first time with the default “Bunpro N5 Grammar” deck that it selected for me. I am just wondering about the order of things here? The grammar SRS is asking questions about using the past form of いい here (e.g. "The test was not good / テストはよくなかった ). It feels really weird to have that though, considering that there hasn’t been a grammar point yet for how to conjugate anything in the past tense? So it is hard to follow what exactly is being done to get this into the past test, and if this is “normal” for past test (like where did this な come from? Why wouldn’t it be ない?), or something specific to いい. From the grammar point I thought the corresponding SRS was just going to be “if you are negating いい, then say よくない instead of いいない” and not “…and also ma...

      • freundchen

        freundchen

        Also am very confused … just been shown this, without having been introduced what “い-adjectives” are and that (or how) adjectives are being conjugated.

        did i miss something? Shouldn’t there be something about adjectives, the types, and their conjugation, before this is dropped onto the learner?

      • MOA_304

        MOA_304

        I was confused too just now so I went to Google. Here’s what I found:
        Non-Past Form(~ない)
        Non-Past Negative Form(~ません)
        Past Form(~した)
        Past-Negative Form(なかった)

      • MOA_304

        MOA_304

        I was confused too just now so I went to Google. Here’s what I found:
        Non-Past Form(~ない)
        Non-Past Negative Form(~ません)
        Past Form(~した)
        Past-Negative Form(なかった)

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