When will they arrive? Please tell us. ----- Please tell us when they will arrive.

　　賓語從句的引導詞

　　(1) 陳述句作賓語從句引導詞用that。that在從句中不充當任何句子成分，無實際意思，在口語或非正式文體中常省略。如：

　　He said (that) it was cold in Moscow. Mother knows (that) Jim will work hard.

　　(2) 一般疑問句作賓語從句引導詞用whether或if。whether或if表示“是否、是不是”的意思，不能省略。如：

　　I want to know if / whether the answer is right. Lucy asked if / whether they had a cheaper shirt.

　　(3) 特殊疑問句作賓語從句引導詞用原來的疑問詞，只不過在賓語從句中稱作連接代詞或連接副詞。連接代詞或連接副詞在從句中充當一定的句子成分，有一定的意思，不能省略。如：

　　Please tell him which class you are in. He asked me whom I was waiting for.

　　Could you tell me where the post office is? Please ask the teacher how we can get there.

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