?(2) or的用法:
?① 作或者讲
?例: You or your friend has to go to the teachers' office.
?② 作否则讲
?例: Hurry up, or you will be late for school.
?(3) and与but:
?例: He has no money and he is poor.?
He is poor but he is honest.
4. 介词
?(1) 表示时间:
?at: 表示某一时间点
?如: at noon
?on: 表示特定的日子
?如: on Christmas
?in: 表示一段不具体的时间
?如: in the morning, in the Second world war
?? 如表示在某一特定的早上、下午则用on
?如: on a cold morning, on a hot afternoon, on Sunday morning
?during: 表示期间内的某个时期
?如: during the night, during the Second World War
?for: 其后接表示一段时间长度的词
?如: for three days
?through: 表示在整个期间没有间歇
?例: It snowed through the night.
?till/until: 表示动作持续的终点
?例:I studied hard till twelve o'clock last night.
?by: 表示动作完成期限
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