on a warm evening of summer为什么用on?

on a warm evening of summer为什么用on? on the summer evening为什么用on 英语翻译On a warm summer's evening on a train bound for nowhereI 英语翻译was nine o'clock on a warm summer evening.i stood at the 英语翻译2.Synopsis of Act One:On a summer evening,a birthday cel On a warm spring morning,they arrived in London.请详细解释为什么用On 这里为什么用on the evening? 英语翻译第七课的片段：On a summer evening,a birthday celebration is goi （ ）a nice cool summer evening.选 (on\in\for\at) the analysis of Stopping By woods on a snowey evening London ( ) the evening of June 1 st.括号里面用on 还是用in 为什么? 1.用on,in,of填词 wang jun was born in beijing（ ) a hot evening(