Question

英语中什么是介词

Answer 1

英语中介词是：

介词（是prepositions,简称prep),又称前置词,是英语中最活跃的词类之一,连接主语和表语.特别是一些常用介词的搭配力特别强,可以用来表示各种不同的意思.英语里大部分习语都是由介词和其他词构成的.介词在句中一般不重读.

在定语从句“介词+who/which”的结构中,不能用that 代替who/which.She is a good student from who we should learn.in , on,at 在……时 in表示较长时间,如世纪、朝代、时代、年、季节、月及一般（非特指）的早、中、晚等. 

如 in the 20th century, in the 1950s, in 1989, in summer, in January, in the morning, in one’s life , in one’s thirties等. on表示具体某一天及其早、中、晚. 如on May 1st, on Monday, on New Year’s Day, on a cold night in January, on a fine morning, on Sunday afternoon等. 

at表示某一时刻或较短暂的时间,或泛指圣诞节,复活节等. 如at 3:20, at this time of year, at the beginning of, at the end of …, at the age of …, at Christmas, at night, at noon, at this moment等. 注意：在last, next, this, that, some, every 等词之前一律不用介词.