当what与that同放句首时怎样区分
1 What he has said about me is true ------这是主语从句。What he has said about me 是从句部分，做这个句子的主语。is是系动词。true是表语。what是从句部分连接词，也是宾语，has said是谓语。
2 That he has refused to help us is true. ------ 这也是主语从句。that是连接词。that引导he has refused to help us这个句子。 that在he has refused to help us里面不做任何成分。
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