e.g. Have you found your lost book? 你找到你丢的书了吗?(一般问句,现在完成时) Has your lost book been found?你丢的书找到没有?(一般问句,现在完成时)E. 有些动词常用主动形式表示被动意义,如动词act, cook, keep , look , open , write, read, sell , wash 等,这时句子的主语通常是没有生命的。e.g. This hall measures 100 metres long and 60 meters wide. 这个大厅长100米,宽60 米。 This pen sells well in that country. 这种笔在那个国家很好销。F. 在一些固句型中常用被动语态结构,如:It is said that … 据说……,人们说…… It is reported that … 据报道…… It is hoped that … 人们希望…… It is well known that… 众所周知…… It is believed that…人们相信…… It must be admitted that…必须承认…… It must be pointed that…必须指出的是……