关于英语从句语法题
\u82f1\u8bed\u7684\u4ece\u53e5\u8bed\u6cd5\u9898\u5e94\u8be5\u9009C,\u53ef\u4ee5\u5f53\u4f5c\u662f\u975e\u9650\u5236\u6027\u5b9a\u8bed\u4ece\u53e5,\u4e5f\u53ef\u4ee5\u5f53\u4f5c\u662f\u63d2\u5165\u8bed\u6210\u5206.
1.which \u5f15\u5bfc\u7684\u975e\u9650\u5236\u6027\u5b9a\u8bed\u4ece\u53e5\u53ea\u80fd\u4f4d\u4e8e\u53e5\u672b,\u800cas\u5f15\u5bfc\u7684\u975e\u9650\u5236\u6027\u5b9a\u8bed\u4ece\u53e5\u4f4d\u7f6e\u5f88\u7075\u6d3b,\u53e5\u9996/\u4e2d/\u672b\u7686\u53ef.
2.as\u53ef\u4ee5\u7ffb\u8bd1\u4e3a"\u6b63\u5982",which \u5219\u4e0d\u80fd.
both of them\u80af\u5b9a\u4e0d\u5bf9\uff0c\u56e0\u4e3a\u6b64\u53e5\u4e0e\u524d\u53e5\u4e4b\u95f4\u6ca1\u6709\u8fde\u8bcd\uff08\u5982and, but\uff09\u8fde\u63a5\uff0c\u56e0\u6b64\u5fc5\u987b\u8981\u9009\u62e9\u975e\u9650\u5b9a\u5b9a\u8bed\u4ece\u53e5\u3002
\u786e\u5b9a\u201c\u6ca1\u4eba\u4e70\u201d\u7684\u5173\u952e\u8bcd\u662f\u201conly\u201d.\u9898\u5e72\u53e5\u610f\uff1a\u4e0a\u5468\uff0c\u53ea\u6709\u4e24\u4e2a\u4eba\u6765\u770b\u623f\u5b50\uff08\u8a00\u5916\u4e4b\u610f\u751f\u610f\u60e8\u6de1\uff09\uff0c\u800c\u4e14\u4e24\u4e2a\u4eba\u90fd\u4e0d\u60f3\u4e70\uff08\u627f\u63a5\u524d\u53e5\u9898\u5e72\u4e4b\u610f\u2014\u2014\u751f\u610f\u771f\u7684\u5f88\u60e8\u6de1\u54e6\uff01\uff09\u3002
2. doubt作为动词，意为“怀疑/疑惑”时，其后的宾语从句有两种形式：
1）如果主句为肯定句，则其宾语从句必须用if/whether引导，即“某人怀疑...是否...”。
如：I doubt if/whether I'll succeed.
我怀疑自己是否会成功。
2）如果主句为否定句或疑问句，则其宾语从句必须用that引导，即“某人不怀疑...”或“某人怀疑...吗？”。
如：I don't doubt that I'll succeed.
我毫不怀疑自己会成功。
Do you doubt that he is a thief?
你怀疑他是一个贼吗？
3. 这两句的主句都是肯定句，所以其宾语从句都必须用if/whether来引导，用that是绝对错误的。
就算是第二句用if来引导条件状语从句也不行，因为那个that还是宾语从句的引导词。
第二句可以这么说：
I doubt if you can pass the exam, whether your parents will be excited.
= I doubt whether your parents will be excited if you can pass the exam.
因为宾语从句含有一个以if引导的条件状语从句，所以整个宾语从句的主句必须用whether来引导，以避免和宾语从句中的条件状语从句的if重复。
第二句是正确的。
可以从意思上来想，这句话的意思是“我对自己能否通过这次考试不确定。
第一句如果是：I don't doubt that i can pass the exam .那就正确了。
第一句话对。
在较早的语法中，doubt 的句型有两个。如果是 I doubt, 则后面接if,如：I doubt if he has one million dollars. 我怀疑他是否有100万。如果是I don't doubt, 则后面接that,句型是I don't doubt that he has one million dollars. 我不怀疑他有100万。但今天的英语，I doubt 之后即可以用if,也可以用that,但是不可以that if 同用。在这里if引导的依旧是宾语从句，“是否”的意思。
第二句才对
比较一下
I doubt that if i can pass the exam。我很怀疑我是否能通过考试
I don't doubt that i can pass the exam.毫无疑问我能通过考试。
（正宗点的说法应该是it is no doubt that I can pass the exam）
不会缺少主句啊，要认真去揣摩意思啦。。。
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