新东方在线：托福语法之难点 1. 动词不定式的将来式 主动：be to do 被动：be to be done 表示预计要发生或按计划要发生的事情 China is to be one of the most important contries in the world. 被动式与过去分词的区别 the surfaces to be glued the surfaces glued 2. 动词不定式的完成时 主动 to have done 被动 to have been done 表示不定式的动作发生在谓语之前 I’m glad to have seen your son yesterday. 3. 某些adj. 后主动表被动 This plas is difficult to come out |
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