日期应该是21st May还是May 21st啊

日期应该是21st May还是May 21st啊 May 21st前用介词on还是in? 五月二十一号用英语中的May.21st还是May.21th May 1st如何说?是May the first 还是May first? 在五月一日,英语怎么说是on May 1st还是at May 1st? on 21st,May.怎么读? may day is ( ) may 1st . May 21st前面应该加in,on,from还是at 5月31日用英文表达,是May 31st,还是May 31th? 日期前面用in还是on如May 27th ( )1st is May Day May 21st,1996 reads?,请问如何读? It's May 21st today.变同义句 Lily's birthday is on 21st May用被动语态改句子Lily ()()on 21st May 5月21日用英文怎么写?是May 1st还是May 1th?好像1日和31日末尾就是st，21日就是th，到底是怎样 May I have ( ) coffee?括号里应该是some还是any? may. may