N2 Grammar ④　わけにはいかない

Can't possibly / absolutely must — moral obligation expressions

'I can't leave a child alone here.' 'I made a promise, so I can't not go.' — わけにはいかない is about social and moral obligation, not physical ability.

What you'll learn

• わけにはいかない: morally/socially can't — 'I can't possibly ~'
• ないわけにはいかない: double negative = must do — 'can't not ~'
• わけがない: factual impossibility — 'no way' (different meaning!)
• わけではない: negates assumption — 'it's not that I ~'

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