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一道英语选择题A student in my class said to me, "If I _____ our mat

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一道英语选择题
A student in my class said to me, "If I _____ our math teacher, I ______ make math learning easier and more interesting instead of giving the kids much homework to do every day."
A . were / would B . am / will
C . was / could D . are / should
I choose B, but the answer is A.
这是个虚拟语气的句子
参考:
1.条件句中虚拟语气的形式
从句中提出一种与客观现实不相符或根本不可能存在的条件,主句会产生的一种不可能获得的结果.条件句中的虚拟语气根据不同的时间有三种不同的形式.
时间
从句谓语形式
主句谓语形式
将来
动词过去式(be用were)
should + 动词原形
were to + 动词原形
would / should / might / could + 动词原形
现在
动词过去式(be 用 were)
would / should / might / could + 动词原形
过去
had +动词过去分词
would / should / might / could have + 动词过去分词
2.条件句中的虚拟语气的举例
(1) 将来时的条件句中的虚拟语气.如:
If he should go to Qing Hua University,he would make full use of his time.如果他要上清华大学的话,他就会充分利用他的时间了.
If he were to come here,he would tell us about it.如果他要来的话,他会通知我们一声.
(2) 现在时的条件句中的虚拟语气.如:
If he were free,he would help us.要是他有空的话,它会帮助我们的.
If he studied at this school,he would know you well.如果他在这所学校学习的话,它会对你很熟悉.
(3) 过去时的条件句中的虚拟语气.如:
If I had seen the film,I would have told you about it.我如果看过这场电影,我会把电影内容告诉你了.
If I had got there earlier,I would have met Mr.Li.如果我早点到那儿,我就会会到了李先生.
3.运用条件句中的虚拟语气时,须注意的几个问题
(1) 当从句的主语为第三人称单数时,谓语动词若是系动词be时,可用 was 代替 were.但在倒装虚拟结构及 if I were you,as it were 中,只能用 were.如:
Were I ten years younger,I would study abroad.要是我还年轻十岁的话,我会去国外学习.
If I were you,I would try my best to grasp the chance.要是我是你的话,我要尽力抓住这次机会.
建议你把最后一句话好好读读,你会明白答案为什么是 A 哟.
不明白的再问哟,请及时采纳,多谢!