2017年12月六级语法常考知识讲解：动词时态
语法是英语学习的基础，也是英语六级考试的基础，掌握好英语语法无论是对六级考试还是以后的英语学习都是有很大帮助的。下面新东方网英语六级频道为大家整理了英语六级语法常考知识讲解，希望能为大家带来帮助!
2017年12月英语六级语法常考知识讲解汇总
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’d 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.
2017年12月英语六级语法常考知识讲解汇总
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