わけがない means "there's no way": the speaker is sure something cannot be
true or cannot happen. It follows the plain form of a verb or い-adjective; a
な-adjective or noun takes な, or である in writing.
。
There's no way he would say something like that.
。
There's no way it's this easy.
。
There is no way he is the culprit.
The polite form is わけがありません. In casual speech が drops out:
.
。
There's no way you'd pass the exam without studying at all.
A reason often comes first with or んだから, and わけがない draws the
conclusion from it.
、。
A professional made it, so there's no way it tastes bad.
わけがない or わけではない
is a soft denial: "it's not that…". わけがない rules the
thing out completely.
。
It's not that he isn't coming.
。
There's no way he's coming.
わけがない or はずがない
also means "it can't be", and the two often swap. はずがない
rests on what you had reason to expect, and sounds calmer; わけがない is the
more emphatic, and the more common in heated speech.
、。
I locked it, so it can't be open.
Lingaku