Definition
Used to indicate that a mistake was made due to a lack of prior knowledge or sufficient information, implying it was not one's fault.
我怎麼會知道？(表示事先不知情所致)
I was just trying to help; how was I to know that room was off-limits?
我只是想幫忙；我怎麼會知道那間房間是禁止進入的？
How was I to know he was allergic to peanuts? I didn’t see any warning signs.
我怎麼會知道他對花生過敏？我沒看到任何警告標誌。
How was I to know you would be there? I thought you had already gone home.
我怎麼會知道你會在那裡？我以為你已經回家了。