別說...，連/即使是...也／都... emphasizes a stronger case.
Let alone
Even stronger case
See examples below for varied real-world usage.
Second case stronger
- ✅ 別說他，連老師都不會。
- ❌ 別說老師，連學生都不會。（強弱需對）
也/都 required
- ✅ 連他也不知道。
- ❌ 連他不知道。
Let alone kids,even adults cannot understand it.
Let alone finishing,we have not even started.
Let alone going abroad,there is no time even for local trips.
Let alone him,even I am not sure.
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