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英语四六级英语常考知识点讲解
语法是英语学习的基础，也是的基础，掌握好英语语法无论是对还是以后的英语学习都是有很大帮助的。下面频道为大家整理了常考知识讲解，一起来学习一下吧!
英语常考知识点讲解：动词时态
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.
英语常考知识点讲解：动词时态
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.
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