题目内容
16．电影开始半小时了．The filmhas beenon for half an hour．
分析 has been on．
解答 答案：has been on．begin开始的动作发生在过去，持续了一段时间，故用现在完成时have/has+过去分词，begin是短暂性动词，不能与一段时间连用，故用be on，主语the film，故has，be的过去分词been，故答案是has been on．
点评 现在完成时有两种用法1．过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作．2．表示过去发生的、持续到现在的动作或状态．
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