例句来自张道真英语语法:it rained immediately after my arrival.在此句子中,书上给的解释是:immediately为副词,修饰介词after,然后after my arrival这个介词短语修饰动词rained。我感觉还有一种理解是immediately为动词直接修饰动词rained,after my arrival为介词短语直接修饰动词rained。这两种用法有什么区别啊?