作业帮_in the regulations that you should not tell other people the password of your email account.A.what is required B.what requires C.It is required D.It requires为什么不用what 为什么说这是that引导的主语从句,it作形式主语?
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_in the regulations that you should not tell other people the password of your email account.A.what is required B.what requires C.It is required D.It requires为什么不用what 为什么说这是that引导的主语从句,it作形式主语?
_in the regulations that you should not tell other people the password of your email account.
A.what is required
B.what requires
C.It is required
D.It requires
为什么不用what 为什么说这是that引导的主语从句,it作形式主语?
_in the regulations that you should not tell other people the password of your email account.A.what is required B.what requires C.It is required D.It requires为什么不用what 为什么说这是that引导的主语从句,it作形式主语?
首先,如果用what的话,what is required 是一个名词性从句（即,它的作用相当于一个名词）,在句子中做主语,完整句子是这样的：What is required in the regulations “is” that you should not tell other people the password of your email account.注意到了吗?你需要加一个is在that前面.这句话等于：The requirement is that...
如果that前面有is,这道题就要选A了.可现在that前没有is,那么这句话就应该这样分析：
It is required that you should not tell other people the password of your email account.意思是什么?that后面的句子才是要求的具体内容,如果正常的语序应该这么说： "You should not tell other people the password of your email account" is required.引号里面是才是要求的具体内容,才是真正的主语,可这样说是不是给人非常头重脚轻的感觉?于是,it显神通的时候到了.用it代替整个主语放到前面,用that来把主语引导出来,这样就解决了整个问题.
楼主你懂了吗?
你不能把你email账户的密码告诉别人，这是必须的规定。it is required是一个完整的句子。that所引导的主从句正是it 所代表的内容，所以it就是形式主语。如果引导的句子代表的是前置短语的宾语regulations,那就不能用that,而要用what了。
如果用what的话 what is required ……is that前面部分整体做主语，中间加is 之后句子意思就对了
C It is 动词过去分词 翻译过来就是“据。。。”例如：it is said that the book is lost.据说那本书不见了。