主語疑問句和賓語疑問句

當我們在詢問誰或什麼做了某個行為時要用主語疑問句。如果疑問詞 (who, what, 等)是句子的主詞，則疑問詞後面不用加助動詞。

Who won the match? (不能說 Who did win…)
What happened last night? (不能說 What did happen…)
How many people went to the party? (不能說 How many people did go)

當我們在詢問受格 (動詞後面) 時要用英文疑問句的正常詞序: 助動詞 + 主詞。這種疑問句叫做賓語疑問句。

主語疑問句 vs 賓語疑問句

Jack called Teresa. (Teresa = 受詞)	Jack called Teresa. (Jack = 主詞)
Who did Jack call? (Who = 受詞)	Who called Teresa? (Who = 主詞)

有介系詞的疑問句

在非正式或會話英語中，當疑問詞需要介系詞時，介系詞要放在疑問句的句尾 (動詞或動詞 + 受格後面)。介系詞不能放在句首。

I played tennis with John. ⇒ Who did you play tennis with? 我和約翰一起打網球。 ⇒ 你和誰一起打網球？
I work for a multinational company ⇒ What company do you work for? 我在一家跨國公司工作 ⇒ 你在哪家公司工作？
We usually talk about sports. ⇒ What do you usually talk about? 我們通常談論運動。 ⇒ 你平時都聊什麼？