訳(わけ)がないThere is no way, There is no reason, It is impossible, Cannot be

Structure

Verb［る］⁽¹⁾ + わけがない
［な］Adjective + な + わけがない
［い］Adjective + わけがない

⁽¹⁾ Verb［た］

Détails

Niveau de langue
Standard

À propos de わけがない

One of the strongest ways to use the noun わけ in Japanese, is in the expression わけがない. This is regularly translated as 'there is no way that (A)', or 'it is impossible that (A)'. However, as mentioned in other わけ lessons, わけ is used very similarly to 'so' in English, so may also be thought of as 'it is SO not (A)', with 'so' being used for emphasis. In this structure, わけ is combined with the case marking particle が, and the い-Adjective ない.

わけがない may be used with verbs, or adjectives in their attributive form.

Caution

Compared to わけではない, わけがない is much stronger, and emphasizes the 'non-existence' of something. This can be thought of as similar to the difference between 'it is so that it isn't (A)' (for わけではない), and 'it is SO not (A)' (for わけがない).

'It is so that it isn't (A)' highlights that (A) is a thing that exists, but not in the way of (A). On the other hand, 'it is SO not (A)' highlights that no part of (A) whatsoever can be considered to be correct/accurate.

Exemples

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彼(かれ)が嘘(うそ)をつくわけがない。

There is no way he would lie.

あんな大(だい)ニュース、知(し)らないわけがない。

There is no way not to know this. It is such big news!

日本人(にほんじん)ならそんなことを言(い)うわけがない。

There is no way that a Japanese person would say that.

あれだけ着込(きこ)んだら寒(さむ)いわけがない。

There is no reason why you would feel cold, wearing all those extra clothes.

そんなやり方(かた)でうまくいくわけがない。

With the way you're doing it, it is impossible for it to go well.

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わけがない – Discussion Grammaire

Réponses les plus récentes (7 au total)

Anthropos888
Here another example from the JLPT 2 exam:

暑い地方でも、泥と草で太陽光線を避ける家を作れば、激しくなるという _____。
1. わけがない
2. わけにはいかない
3. わけだ
4. わけではない
When I see all the different わけ together my brain just shuts off

So except for 3) the other answers wouldn’t make any sense at all?
blacktide
I see the following note on this grammar point:

わけがない can be replaced with はずがない, but not always the other way around

Would it be that はずがない doesn’t denote the same level of impossiblility as わけがない? Like はずがない is very unlikely but not impossible, whereas わけがない is certainly impossible?
Daru
Exactly! Its all about level of certainty/possibility.