3週2日目 太るわけだ
Development・time・result
接続：普通形＋わけではない
not really, by no means
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／〜わけがない. 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＋わけではない。Partial negation, so the next part often has が・けど to continue. Completely different from 〜わけがない (completely negative).
嫌いなわけではないが、今は食べたくない。
It's not that I hate it, I just don't want to eat it right now.
高い物が必ず良いわけではない。
Expensive things don't always mean good things.
反対しているわけではなく、もう少し考えたいだけです。
It's not that I object, I just want to consider it a little more.