(二)被动语态常用的八种时态 1. 一般现在时： am / is / are + 过去分词 1）主动：People grow rice in the south of the country. 被动：Rice is grown in the south of the country. 2）主动：The school doesn't allow us to enter the chemistry lab without a teacher. 被动：We are not allowed to enter the chemistry lab without a teacher.