“介词+关系代词”引导定语从句,不仅使主句和从甸联系起来,同时还在从句中充当状语或定语等成分.介词的选用是否恰当是句子正确与否的关键,那么如何确定使用哪一个介词呢?我们可以从下列三种情况考虑.一、定语从句的谓语部分不完整.从句的谓语动词多数是不及物动词是这类句子的特点.此时先看从句的谓语动词和主句中充当先行调的名词之间是一种什么关系,这种关系往往需要一个介词,介于二者之间,构成“动词+介词+名词”的短语,选定介词之后,动词位置不变,“介词+名 “Preposition + relational pronoun” guides the attributive clause, not only linking the main sentence with Sengtan, but also serving as an adverbial or attributive component in the clause. The proper choice of preposition is the key to the correctness of the sentence, then how to determine which sentence to use? A preposition? We can consider the following three conditions. First, the predicate part of the attributive clause is incomplete. The predicate verb of the clause is mostly the intransitive verb is the characteristic of this type of sentence. At this time, look at the predicate verb and the main clause. What is the relationship between the prepositional nouns in a sentence? This relationship often requires a preposition. Between the two, it constitutes the phrase “verb + preposition + noun,” and after the preposition is selected, the position of the verb is unchanged. , "preposition + name