3週2日目 太るわけだ
Development・time・result
接続：普通形＋わけがない
no way, that's impossible
注意 / Note：わけだ is the logical conclusion; わけではない partial negative; わけがない strong negative.
比較 / Compare：Same song: 〜わけだ／〜わけではない. These models are often mistakenly chosen for each other — carefully read the 接続 and nuances above and then decide.
よく出る形 / Common form：普通形＋わけがない。Strong negation, based on the speaker's inference. The spoken word shortens to 〜わけない.
彼がそんなうそをつくわけがない。
There's no way they would lie like that.
一日で全部覚えられるわけがない。
Can't remember it all in one day.
こんな短時間で全部終わるわけがない。
In such a short time, there's no way it can be finished.