in ,on 一类的可以做介词又可以做副词的单词如何在句子里面区分他是副词还是介词?

它们1)作介词时,后面要带名词成分的,如 in the house,a country in Africa,It's in that drawer.等；2)作副词时,后面不带名词成分的,如She opened the door and went in. 再如Several new Labour councillors got in at the last
election. 又如 Nobody was in when we called.
可以用同样意思in做介词和in做副词的句子对比一下,就用上面最后一句：
1）Nobody was in when we called. （in做副词）
2）Nobody was in the house/office when we called. （in做介词）
希望能帮到您,祝好~

做介词的话后面跟的必须是名词或者动词的ing形式，做副词的话它修饰的动词没有明显的变化。这种复杂词性的词只能碰到一个学习一个，辞典上的解释有好几页呢，想完全弄懂弄清非常困难