第1个回答 2022-09-29
虚拟语气应该是必修3第一、二单元的知识点.
常规下虚拟语气的考查点分两个:
一是名词性从句中should do结构,should可以省略.在名词性从句中,如果出现表示“命令,建议,请求、计划”的词,不管它用于什么名词性从句,都要求使用虚拟语气.如:
He suggested that we (should) finish the task on time.这是宾语从句,suggest是“建议”的意思.又如这词用于表语从句:
His suggestion was that we (should) finish the task on time.
在这种从句中,要注意一点就是:如果从句的主语和谓语动词之间是被动关系,那么就要用(should) be done结构,就和情态动词的被动形式一样.如:
He ordered that the task (should) be finished on time.
二是条件状语从句中的虚拟语气.从句和主句的谓语动词有严格规定,如下:
从句, 主句
和现在相反: did/ were would/could/ should/ might do
和过去相反: had done would/could/ should/ might have doe
和将来相反: did/ were to do/ should do would/could/ should/ might do
如:如果当时你没帮助我们,我们不可能完成这工程.
If you had not helped us then, we couldn't have pleted the project.(与过去相反).
如果我是你的话,我会用另一种方法.
If i were you, I would use another way to do it.(与现在相反),这句中,要注意到我用的是were.尽管主语是单数,虚拟语气中的一般过去式,不能用was.
这些是基本规则,当然还有很多其他的.如:
I wish that.这个结构是个名词性从句中的宾语从句,但是它使用的虚拟语气不与我上面讲到的相同.这个句型中,宾语从句的时态要往过去推前一步.即:如果与现在相反,用一般过去时,如果和过去相反,用过去完成时,如果与将来相反,用过去将来时.
如:I wish that i were a bird.与现在相反
I wish that i hadn't wasted a lot of time before.与过去相反.
要全部讲具体,比较难,建议你系统看一下相关语法书会好些.,2,