✔ 最佳答案
Indirect question 其實就係 indirect speech，又可以叫 Reported speech，只不過原來的語句是個問題而矣。
Jacky asked if I wanted something to eat
這句是 indirect speech 也是 indirect question。
Indirect speech 通常都用 Past Tense 因為講明係 reported，將事情講番出來。不過 Present Tense 也有可能，要看作者用法。
"How do pandas chew bamboo?"
I was wondering how pandas chewed bamboo.
這句的 main clause 是 I was wondering。
how pandas chewed bamboo 是 noun clause，整句的 object。
由於 main clause 係 Past Tense，後面亦要將原來時式轉為過去時式。
Did you win the game yesterday?
Indirect question 當面問人
I wonder if you won the game yesterday.
I would like to know if you won the game yesterday.
Reported speech 事後寫出來
I wondered if he won the game the day before/that day.
I would like to know if he won the game the day before/that day.
you 轉為 he。
可能已是幾日後，yesterday 的 time reference 已不正確，所以用 the day before 或 that day。
2008-07-19 00:23:16 補充：
最後一句 Past Tense 應轉為 Past Perfect Tense
I wondered if he had won the game the day before/that day.
I would like to know if he had won the game the day before/that day.
