2015年GCT工程硕士英语考试词汇语法指导(49)
发布时间:2009/11/20 14:49:44 来源:城市学习网 编辑:紫藤
1.虚拟式可用于wish后的宾语从句中,表示与事实相反的愿望。其表达形式一般是将谓语动词提前一个时态。例如:
I wish I had been to the concert last night.
I wish he would forgive me.
2. It’s (high, about)time that…的句型要求用虚拟式,表示应该做还没有做的事。其表达形式一般是谓语动词使用过去时态。例如:
It’s high time that he stopped smoking.
It’s about time that we took our leave.
3. 在I would (had) rather后的句子中,动词也要求用虚拟式,表示某人的愿望。其表达形式一般是将谓语动词提前一个时态。例如:
I’d rather you left tomorrow instead of today.
I’d rather he hadn’t done anything like that.
4. 在由as if、 as though引导的方式状语从句中,表示和现在事实相反或对现在情况有所怀疑,或表示与主句谓语动词同时或其后的假设情况时,从句中谓语动词用过去时。表示过去想象中的动作或情况或表示在主句谓语动词所表示时间之前的假设情况,从句用过去完成时。如果表示的情况很可能发生或是事实,则用陈述语气。例如:
She looks as if she knew all about it.
They talked as though they had got acquainted with each other for years.
5.在if only引起的感叹句中,用谓语动词的一般过去时表示与现在的事实相反的情况,用过去完成时表示与过去事实相反的情况。例如:
If only he knew our telephone number!
她要是知道我们的电话号码该多好啊!
6.在lest、for fear that、in case等词引导的从句中,谓语动词用should + 动词原形表示虚拟。Should一词也可以省略。例如:
Grown people should never say or do anything wrong before children, lest they (should) set them a bad example.