This means you are sure something is not true. You have a good reason to believe it is impossible.
Verb [dictionary form] + はずがないPrimary
い-Adjective + はずがない
な-Adjective + な + はずがない
Noun + の + はずがない
This means you are sure something is not true. You have a good reason to believe it is impossible.
あの真面目な彼が、約束を忘れるはずがない。
There's no way that serious guy would forget a promise.
昨日、家にいたと言っていたから、彼がその事件の犯人であるはずがありません。
He said he was at home yesterday, so it's impossible that he is the culprit in that incident.
彼が来ないはずがない。きっと道に迷っているんだ。
It can't be that he's not coming. He must be lost.
その理論が正しいはずがないと、多くの科学者が主張している。
Many scientists are arguing that the theory cannot possibly be correct.
計画は完璧だったから、失敗するはずがなかったんだ。
The plan was perfect, so there was no way it could have failed.
This phrase is like a strong, locked door. You are very sure something cannot happen. You have good reasons for this. It is not just a guess.
Both 'はずがない' and 'わけがない' mean something is not true. But 'はずがない' uses facts to say something is impossible. For example, 'He studied a lot, so he can't fail.' 'わけがない' means something is impossible because it just doesn't make sense. For example, 'I can't beat a pro player.'
Don't use this when you decide not to do something. For example, don't say "I won't go to the meeting" with 〜はずがない. That sounds strange.
Often confused with(1)
More formal alternatives(1)
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