in 後面接"線段的概念"
ex. in the morning, in the afternoon, in the evening, in a year, in decades, in a century
on 後面接 "特定的日子"
on May 15th, on Friday, on Mother's day, on Christmas Eve..
at 後面接 clock time
at 8:30am, at noon(12:00pm), at midnight(12:00am)..
還可接 at Christmas 在耶誕的這個時節(後面不加day)
因此,
*on Monday morning-->在禮拜一的早晨(以Monday為主)
*on May 11th, morning(跟著特定的日子走)
i*n the morning of May 11th( 跟著morning走,而這個早晨是屬於5/11)
( 以上敬請參照Azar Fundamnetals English Grammar p.163)
但我卻在Time Express(時代解讀雜誌)2003.3一篇Stalking SARS的文章中,看到 on the morning of February 11這種用法,似乎已有混用的情形,如擔心誤用,還是建議您用 on May 11, morning 以避免爭議.
圖片參考:
http://l.yimg.com/f/i/tw/ugc/rte/smiley_8.gif
以上,供您參考!
2009-05-15 18:20:02 補充:
Time Express(時代解讀雜誌)2003.5/Stalking A Killer的文章, "on the morning of Feb. 1"
參考: above 15 years teaching experience