英语句子成分分析实例(中学程度)-4

老师：烦请帮我看一下以下我对句子成分的理解是否正确。如有不对的地方，烦请指教和补充。谢谢！

All I know is that his father used to be an army officer.

主句的主语：all I know

系表结构，作主句的谓语：used to be an army officer

all和is that分别为形容词与定语从句，均修饰句子的主语I

在定语从句中，his father 为从句的主语，that 修饰 all I know且引导从句

(1) 主句的主语： All I know

谓语：is

宾语：that his father used to be an army officer.

That引导宾语从句

(2) 宾语从句是：his father used to be an army officer.

从句的主语：his father

谓语：used to be

宾语：an army officer

cici -

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