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即介词。
前置词，也称为前置词，是英语中一种重要的虚词，主要用于描述两个基本结构之间的关系。前置词通常用于连接名词、形容词、分词、代词等。以下是前置词的一些常见含义和用法以及相应的造句： 1. about: a. 在……附近: He lives about two miles from the office. b. 关于: Ask him about his opinion about this issue. c. 关于: I don't know about you, but I am feeling very tired. 2. after: a. 在……之后: She arrived after I left. b. 追随: She followed her dream after her parents' encouragement. c. 继任: He will be the after person to take over the position. 3. at: a. 在……时候: She arrived at 9 o'clock. b. 对于: At this moment, I am at my worst and at my best at the same time. c. 致力于: He is at work at writing a novel. 造句： I saw him arrive at the airport after he landed from his flight. After finishing work, she headed home. At that moment, she was feeling happy and at the same time exhausted after a long day's work. 4. before: a. 在……之前: They arrived before me and I was left behind. b. 早于……时候: I woke up before my alarm went off. c. 在……面前: I am standing before you today to tell you my story. 5. in: a. 用……(时间)段: We usually work in the morning from 9 to 12. b. 在……之内: Can you finish this task in one day? c. 以某种方式: I spoke to him in a friendly tone of voice. d. 在……里面: She lives in a small apartment in the city center. 造句： She arrived before me and we met up before going our separate ways home. I am writing to you in anticipation of your response. In the end, she managed to finish the task on time despite the difficulties she encountered along the way. I walked into the room and found her sitting in there reading a book. 6. on: a. 在……上面: She placed the book on the table and opened it to the page she wanted to read. b. 关于: I am writing to you on this topic because I have some thoughts to share with you. c. 按照: We will meet on time and not be late for the appointment. d. 在……时候(常与the day连用): On the day of my birthday, my family gathered together to celebrate my special day. 请注意，这些只是一些常见的前置词及其用法和造句的例子。英语中还有其他许多前置词，用法和含义可能略有不同。具体用法需根据语境进行判断。