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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 2017, 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 (2)by, during, for, till, until ⑤by表示“不迟于；到……为止”。 by six o'clock, by the end of last month ⑥during表示一段持续的时间，也可以表示这段持续时间中的某一点或某一刻。 during the summer vacation ⑦for表示一段时间，后面接具体的时间单位，后边的名词常用复数。 I have been working here for five years. ⑧till和until表示一段时间，till用在肯定句中与持续性动词连用，until用在否定句中，与瞬间动词连用。 Although the lecture was very boring, he stayed till the end of it. | 
