whether是名詞性從句中的什麼詞

名詞性從句包括主語從句，賓語從句，表語從句和同位語從句.

whether用於主語從句：

Whether I knew John doesn't matter.

whether用於賓語從句：

It all depends on whether we can get their cooperation.（注意：本句it是代詞）

whether用於表語從句：

The question is whether we can finish our work by tomorrow evening.

whether用於同位語從句：

The question，whether we need it，has not yet been considered

whether是名詞性從句中的連線詞，具體內容如下。

從結構上說，英語連線詞分兩大類：並列連詞（coordinating conjunctions）和從屬連詞（subordinating conjunctions）。

並列連詞連線兩個或兩個以上地位平等的字、片語或分句。例如：(1) Air and water are indispensable to me.

(2) She likes going out with friends or playing outdoor games.