语法!非常难的几个问题,语法专家帮忙看下,

It was recognized that food contained protein。这是形式主语句 it是形式主语 that从句是真主语  It不可能指代上文中的某一件事或某一件东西,因为如果如此 语法不对 应该用主动语态  that food contained protein位于recognized后,这里不可以是宾从因为 主句谓语是被动语态
2。He went a step further in recognizing that he was looking for a strategy。这句话中的that引导的是宾语从句 作动名词recognizing的宾语  动名词具有动词特征 可以带自己的 宾语 
3。一个名词可以跟2个定语从句但 须并列:It is the question that he asked that makes me angry。这句话如果不是强调句型 应该 把 第二个that去掉  he asked改成 he thought  是插入语 也可以去掉 It was the question that he thought made me angry。这样的句型  不属于 两个定语从句如果 不去掉 第二个that 原句 则是 强调句型  也不属于 两个定语从句It is the question that he asked that makes me angry
=   the question that he asked  makes me angry对主语the question that he asked 强调  不过时态有点问题。
4。Experts say that one of the ways that job seekers can stay safe is to conceal their identities。这句话中第二个that引导的是定语从句  修饰  one of the ways这里 that=in which say 后面是宾语从句one是宾从中的主语 is 是宾从中的系动词  to conceal their identities是宾从中的表语。
5。It applies to traditional historians and to social science。这句是简单句有2个动词以上的不一定是并列句 因为是并列谓语有2个主语以上也不一定是并列句 因为是并列主语 简单句的定义 是  有一个主语或并列主语 一个谓语或并列谓语 组成的句子 是简单句

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再答： it +����+that���־��Ͷ�����ʽ��
2。a step�DZ����������� ���ݴʶ��� ������ ���� a stepfurther�����ݴ� ������ ��ʶ��� ��״�� ���� ���ݴ�in�ǽ�� ������ ����ʶ��� ����ʱ���recognizing�Ƕ���� ������ that��ı���Ӿ� ������ʵı��� ԭ��=。He went a step which was further in recognizing that he was looking for a strategy
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