内容正文:
介词又叫前置词,是一种虚词。一般位于名词或代词之前,在句中不单独作任何成分。介词本身有独立的含义,但意义不够完整,在句中使用时,后面必须接宾语构成介词短语后,才能表达完整的意义。介词短语在句中常作状语、定语、表语和宾语补足语。
第五章 介词和介词短语
考点1 介词的用法
1.表示时间的介词
介词 用法 举例
at,
on,
in at表示某一时刻、某一钟点或假期期间 I woke up at 7 o'clock.
Everyone seems happy at Christmas.
on表示具体某一天或具体某一天的上午、下午和晚上 We will visit you on Tuesday.
I will return to my hometown on 27th of this month.
The story happened on a cold winter night.
in表示月份、季节、年份、世纪、上午、下午、晚上 My birthday is in February.
I was born in 2002.
Life was different in the 19th century.
介词 用法 举例
after,
in “after+一段时间”,表示从过去某时间往后推算一段时间,用于一般过去时,“after+时间点”,常用于一般将来时
They came back after two days.
They will be free after 2 o'clock this afternoon.
in+一段时间,表示从现在起往后推算一段时间,用于一般将来时 They will be back in two days.
介词 用法 举例
from,
for,
since from说明开始的时间,可用于过去、现在、将来的时态 We go to school from Monday to Friday.
“for+一段时间”,指动作延续贯穿整个过程,用于现在完成时 They have been here for 5 days.
“since+时间点”,指从某时一直延续至今,用于现在完成时 They have been here since 5 days ago.
介词 用法 举例
until until用于肯定句时,意为 “直到…