语法对点讲练十二 介词、并列连词一、常用介词 知识点讲解 1.表示时间的介词 (1)at, on, in ①at表示时间点,也可表示节假日。 at 3:00, at noon, at that time, at christmas day ②on表示一天或某天的一部分。 on monday, on friday evening, on september 24 ③in表示少于或多于一天的时间段。 in the evening, in a week, in three days, in 2013, in my childhood ④morning, evening, afternoon, night等名词如果有表示具体某一天的名词修饰时,用on。 on monday morning, on a cold winter morning