句子成分分析it's difficult to fix my mind on what Iam doing.it形式主语,is是谓语,difficult后面是宾语吗 而what又充当什么成分呢,是宾语吗,求详解

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句子成分分析it's difficult to fix my mind on what Iam doing.it形式主语,is是谓语,difficult后面是宾语吗 而what又充当什么成分呢,是宾语吗,求详解
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句子成分分析it's difficult to fix my mind on what Iam doing.it形式主语,is是谓语,difficult后面是宾语吗 而what又充当什么成分呢,是宾语吗,求详解
句子成分分析it's difficult to fix my mind on what Iam doing.
it形式主语,is是谓语,difficult后面是宾语吗 而what又充当什么成分呢,是宾语吗,求详解

句子成分分析it's difficult to fix my mind on what Iam doing.it形式主语,is是谓语,difficult后面是宾语吗 而what又充当什么成分呢,是宾语吗,求详解
to后面的是真正的主语,difficult是表语,与be动词成系表结构,what后面的是宾语从句

这是形式主语