※ 引述《thebeginning (当我们宅在一起)》之铭言： [On] What day do you have PE class? 问者认为 1) 体育课只有一天，或 2) 体育课到底有几天其实与他无关 例一： What day do you have PE class? Tuesdays and Thursdays. Oh, mine's on Monday. [问者自己体育课只有一天，所以假设答者也只有一天] 例二： What day do you have PE class? Tuesdays and Thursdays. Let's have the birthday party on Monday, then. [问者只是要确定体育课是否会与派对撞期，其实并不关心体育课到底有几天] [On] What days do you have PE class? 问者认为 1) 体育课不只一天 2) 体育课具重复性 例一： What days do you have PE class? Tuesdays and Thursdays. Ahh, mine too, maybe we'll have PE together! 例二： What days do you have PE class? Tuesdays and Thursdays. We can't have our reading group on Tuesdays, then. 单复数代表重复性在下面的例子最明显： 亲戚：When's your surgery? 病患：Monday. 护士：When's your surgery? 实习医师：Mondays. -- 'Cause it's a bittersweet symphony, this life Trying to make ends meet, You're a slave to money then you die -Bittersweet Symphony, The Verve --

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