Question

问一个简单的英语问题！！

Just as you might look at the date a book was published,you must also check the dates of the sites you find.
求问第一句中，date后面为什么不加that?那个 a book was published在这里是什么成分？那个that 可省略么？

Answer 1

a book was published 是 date 的后置定语，that可以省略

追问

那什么时候that 不可省略？

追答

如果仅仅是引出定语来修饰前面的词，that貌似都可以省略，它没有实际的意思，只是起引出作用

Answer 2

后置定语 可以省略
没有实际的意思，只是起引出作用

Answer 3

a book was published在这里是宾语。that在它后面接宾语从句时可以省略，其它情况不可省略