大学英语四级语法 大学英语四级语法精要.doc

大学英语四级语法 大学英语四级语法精要 大学英语 语法精要 2 Ⅰ动词(时态,语态,用法,省略,一致性等) 1. 时态 1)现在完成进行时态 (have/has been + -ing 分词构成): 动作或状态从过去某时开始,继续到现在,可能继续下去,也可能刚刚结束. I’ve been writing letters for an hour. I’ve been sitting in the garden. 2)过去完成进行时(由had been + ing分词构成): 过去某个时刻以前一直在进行的动作 I抎 been working for some time when he called. We had been waiting for her for two hours by the time she came. 3)将来完成进行时: 将来某个时刻以前一直在进行的动作. By next summer, he will have been working here for twenty years. In another month’s time she’ll have been studying here for three years. 4)将来完成时(由shall/will have + 过去分词构成): 将来某时会业已发生的事. I shall have finished this one before lunch. They’ll have hit the year’s target by the end of October. 2. 语态 1) 可以有两种被动结构的类型,例如: 3