首先,情态动词 could, should,其本身就有情态含义
could表示具有某种能力能做某事。表推测只用于否定和疑问意思是“...不可能”“....可能吗?”
should 表 “应该...”,如表推测是:“按说应该....”还可表示对未来的期望。
would表示 意愿,意志。
虚拟语气关于 wish的宾语从句:
1、wish后面的宾语从句多表示虚拟,即,与现在过去的事实相反或者是一种不可能实现的愿望。常译为:"但愿....." 或 "........就好啦" 。谓语动词的构成形式为:
(1)过去时(宾语从句与wish同时发生)
如:I wish (that)I were as young as you.
(2) 过去完成时(宾语从句动作先于wish)
eg: I wish (that) I had met that film star yesterday.
(3)过去将来时(宾语从句动作后于wish)
构成: could/would/might + 动词原形(愿望用would能力could)
eg: Isn't it your wish that you could buy a car like that?
虚拟语气关于 should的宾语从句:
用于表示建议,愿望,命令等词的后面,常见的动词有:suggest,order,insist,advise,demand,require,propose.等
构成为:should+动词原形, should可以省略。
eg: They insisted that the boy (should ) go with them.
He suggested that we (should) start off early the next day.
注意:当insist表示坚持认为的意思时,不能使用虚拟语气
eg: The man insisted that he had never stolen the miney.
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