e句英文文法岩唔岩?

如果問自己"我上一次一點前睡覺係幾時呢?"
可以用"When did I last sleep before 1am?", 主詞和動詞倒裝

但如果要講"我唔記得上一次一點前睡覺係幾時啦."
因為嚟句唔係疑問句, 所以when後面既主詞和動詞唔駛倒裝

建議改為: I have forgotten when I last went to sleep before 1AM.

2010-05-21 02:43:46 補充：
When did you last have a cigarette? (Example from Cambridge dictionary)
last本身作副詞用已可解作"上一次", 寫出來的句字比較簡潔

2010-05-21 03:12:34 補充：
Definition from Cambridge dictionary

forget -- verb ( NOT REMEMBER )
[I or T] to be unable to remember a fact or something that happened.

2010-05-27 05:38:49 補充：
Definition from Google dictionary:
to be unable to remember information that you knew in the past

The definition sheds more light on the difference. But I think it is up to the asker to determine whether the info is something you knew before.

forget ≠ not remember

Jenkin (004) is right about using "not remember" in the context of the question.

2010-05-28 00:25:32 補充：
On (003) Jenkin's again.
By a certain time, by Friday, by 3 pm, etc. usually refers to a deadline, a promise, or a time critical mission.

Before is more appropriate in this context.

I have forgotten when did I (finally) sleep before 1am...
(I think this sentence is a little bit better.)

只能告訴你正確係這樣寫你要寫的意思(唔單單是文法的問題，用詞修辭和句式你寫的都不是「英語人」會講的：

I don't remember when did I go to bed by 1AM last.
[請參考最下另一句比較正式的英語寫法]

試略解釋：

英語人在這情況下不會用forget，因為forget是指忘記了一做一件事才用的。記憶裏面的東西他們只會用remember和don't remember.[試看多一些英語劇或小說留意不要用中文去讀才會讀出分別來。]

sleep是一種狀態，一般講去睡覺這個動作在小六以上應該識用go to bed而不是sleep。

before 1AM不能說錯，但before英語人通常會在對比兩件事的前後發生時才會用，這裏是講在凌晨一點前的任何時間，那麼一般用by X o'clock已經代表所有在x之前時間。將來你寫公文或信亦是一樣，不要寫Please reply before this Friday，如果對方是英語人便會知你這些是港式英語，中文人則看不見問題，但仍是錯的英文，應該寫：Please reply by the Friday.才是正確英文。

最後那個last要放在最後亦是英語習慣，其實正式英語句是要寫成
I don't remember when was the last time I go to bed by 1AM.
由於省略(the...time)，因為當然是在說「上一次」那次，所以好像中文可以省略「一」，但又要合文法，所以remember之後要跟個object(I)組成受語，於是把last改為放在最後成為go to bed by 1AM的adv. 如果你未及中五水平我建議你學這句先。

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