文法の説明

N3 レッスン 1: 1/22

ばいい

Can, Should, It'd be good if

使い方・接続

Verb［ば］+ いい

詳細

  • 使用域

    Standard

  • 使用域

    一般

「ばいい」の情報

In contrast to ばよかった, which is used for expressing regret about something that someone wishes had been done, ばいい highlights that the speaker is hoping for a particular result, in relation to something that has not happened yet. This translates as 'It'd be good if (A)'.
To use ばいい, add the conjunction particle ば, to the end of any verb, and then attach the い-Adjective, いい.
  • どれを食(た)べればいいか迷(まよ)ってるところ。
    About which would be good to eat, I am currently a bit lost.
  • 行(い)ければいいけど、行(い)けるか分(わ)からない。
    It would be good if I could go, but I don't know if I can.
Although ばいい literally means 'if (A), it's good', it can also be used to give advice, and has a meaning that is similar to 'should (A)' in these situations. It is generally quite a soft way of giving advice.
  • テストでいい点(てん)を取(と)りたかったら、勉強(べんきょう)すればいいんじゃない？
    If you want a good grade on your test, shouldn't you just study?
  • そんなに疲(つか)れているなら、仕事(しごと)を休(やす)めばいい。
    If you are that tired, you should just take a day off.
Caution
ばいい may also be used when making statements about something that the speaker believes is not possible. In these cases, it is regularly paired with のに, and has the nuance of 'despite it being good if it were (A)'. This shows that the speaker thinks that (A) would be good, but is aware that (A) cannot/will not happen for some reason.
  • 明日(あした)早(はや)く起(お)きればいいのに、全然(ぜんぜん)寝(ね)れない。
    Even though I want to wake up early tomorrow, I can't sleep at all.
  • 好(す)きなら彼(かれ)にそう言(い)えばいいのに。
    Even though you should just say it if you like him… (Why don't you)
  • 休(やす)めばいいのに、皆(みんな)真面目(まじめ)だから休(やす)まない。
    They should take a break, but because they are all very diligent, they won't.

例文

  • 道(みち)の案内(あんない)を、誰(だれ)に聞(き)けばいいのか分(わ)からない。

    I don't know who would be good to ask directions from.

  • 運動(うんどう)すればいいだろう。

    It would probably be good if you exercised.

  • ドライブに行(い)きたいなら、運転(うんてん)免許(めんきょ)を取(と)ればいいです。

    If you want to go driving, it would be good to get a driver's license.

  • すぐに謝(あやま)ればいいのに、結局(けっきょく)謝(あやま)らなかった。

    It would have been good to apologize right away, but he/she didn't apologize after all.

  • 欲(ほ)しいなら言(い)えばいいのに、誰(だれ)も何(なに)も言(い)ってくれない。

    If they want it, then it would be good to say something, but no one is saying anything.

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「ばいい」に関する文法ディスカッション

最近の返信 (合計5件)

  • conan

    conan

    Should there be a notation for よい? Came across that while reading Harry Potter. Threw me off for a bit, haha.

  • DarkConfidant

    DarkConfidant

    What’s the main difference between this and といい and -たらいい?
    They seem very similar, but it won’t take them as the right answer for ones where it wants the other one.

  • mrnoone

    mrnoone

    @DarkConfidant
    Hey

    They are generally interchangeable with small differences being that たらいい feels a bit more casual than といい (and ばいい）and といい cannot be used in questions, while both ばいい and たらいい can, so どうしたらいい and どうすればいい are OK while どうするといい？ is not.
    Another thing, when といい is used when giving recommendation/advice it might have a slight nuance of the action advised might generally be recommended thing to do.

    Other than that they should be interchangeable (in giving advice (though it adds mentioned nuance), also in all cases where one wishes or wonders with といいんだけど and so on), and if they are not accepted than its an error on our side and I’ll fix it (will check all of the sentences one by one).

    I hope it helps,
    Cheers

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