英文中介词的意义是什么

介词是一种连接词，用于连接名词、代词或动词与其他单词，以表达它们之间的关系。介词通常用来表示时间、空间、方向、原因、目的、手段等概念。例如： - 时间：at, in, on - I will meet you at 3 o'clock. - She was born in 1990. - We have a meeting on Monday. - 空间：in, on, at, under, over, beside, behind, in front of, etc. - The cat is sitting on the table. - The book is in the bag. - The school is next to the park. - 方向：to, from, into, out of, etc. - He went to the store. - She came from China. - The bird flew into the tree. - 原因：because of, due to, etc. - He was late because of the traffic. - The game was cancelled due to bad weather. - 目的：for, to, etc. - I bought this book for my sister. - She went to the gym to exercise. - 手段：by, with, etc. - The letter was sent by email. - He cut the cake with a knife.