非谓语动词到底什么时候用过去式啊！不是被动吗？…每次都错

说两句：非谓语动词在句子中的作用可以由相应的从句来替换，（比如非谓作定语可以转化为定语从句，非谓作状语可以变为状语从句）当你不知道该选择哪个是可以尝试将原句转化为相应的从句（本题就是考察非谓作状语的用法），转为状语从句后可为because he ____in his book ,he did not notice........（注意：不一定非是由because引导）显然只可能是was buried 或者was burying .如果你记得有 be buried in这个搭配，就好做多了。本句中强调的是沉迷的状态这一事实，并非强调“进行”————即正在burying。句子想表达的是：他沉迷的后果造成他没注意到别的事情的发生

判断是否是ed 还是ing，你可以还原句子，原句还原结果是He was buried in his book,he didnot notice what had happened.
非谓语动词结构，其实就是因为前后两句的主语都是he，所以省略了he以及助动词，即buried in his book，使前面这个句子变成类似状语的结构，此题非谓语结构是原因状语。同样的，如果原句He concentrated on his book, he didnot notice what had happened. 非谓语结构同理去前面句子，则为concentrating on his book，he didnot notice what had happened。