题目内容
12.我的确不知道他来这儿多久了.I really don't knowhow long he has been here.
分析 how long he has been here.
解答 答案:how long he has been here.这里是考查宾语从句,主句是一般现在时,从句时态不受限制,how long多久,作为引导词,后加陈述语序,来这come here这个动作发生在过去,持续了一段时间,故用现在完成时have/has+过去分词,主语he,故has,come是短暂性动词,不能与how long连用,换成be,be的过去分词been,故答案是how long he has been here.
点评 本题旨在考查宾语从句这一语法,做这类题时,要从三方面考虑:一、选准连接词 二、连接词后紧跟从句的主语 三、若主句是过去时,从句要改为相对应的过去时.
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