The book (which/that) I bought is interesting
关系代词作宾语，which、that代表book, I bought the book, 关系代词可以省略
I bought a book which/that is interesting
关系代词作主语，因为which、that代表book
book is interesting
只要会判断简单句，这个也一样的
I like English
I 主语 like谓语 English 宾语
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