把这个从句还原一下你看看,
We believe the man can speak very good English
believe的宾语是整个句子 the man can speak very good English.而不是the man
明白了吗?第二个that which都可以填？只不过省略了？第二个是指哪个？the book ()is not in the library.哦对，这是第一个the book I need先行词是 the book ， I need是定语从句。 先行词the book 在定语从句中做宾语，这时候可以省略关系代词。例如， The man I love is gone.The bike I bought yesterday is very nice.