“在”字一般常作介词，它具有介词的特点和功能：主要用在名词或名词性词语前面，共同组成“在ＮＰ”（“ＮＰ”为名词性短语），表处所、时间、方位等。它属于介宾短语中的一种。了解并掌握它，对于我们从事语文教学和研究的人来说，尤为重要。　　一、“在ＮＰ”的位置（一 Prepositions are often used as prepositions, which have the characteristics and functions of prepositions. They are mainly used in front of nouns or noun words to form “NP” (“NP” as a noun phrase), premises, time, orientation, etc. . It belongs to a kind of mediator phrase. Understanding and mastering it is especially important for those of us engaged in language teaching and research. First, the “NP” position (one