下面是现在完成时的肯定句、否定句和疑问句的结构：现在完成时肯定句的结构：主语 + have/has + 过去分词 + 其它成分例如：I have finished my homework.She has traveled to many countries.They have been married for ten years.现在完成时否定句的结构：主语 + have/has + not + 过去分词 + 其它成分例如：I have not finished my homework yet.She has not traveled to Asia before.They have not been to the new restaurant.现在完成时疑问句的结构：Have/Has + 主语 + 过去分词 + 其它成分？例如：Have you finished your homework?Has she traveled to Europe before?Have they been to the new restaurant。