英文TENSE

1. Simple Past
"I lost my key."
- 我唔見左條鎖匙.
可以係1秒-好多年前唔見(可以寫番時間), 依家都未搵番.

2. Present Perfect
"I have lost my keys 6 times (since I moved to my new house)."
- 自從我搬左新屋之後, 我已經唔見左條鎖匙6次.
發生係unspecified time, 幾時發生唔重要. 可以當係經驗咁講.

3. Past Perfect
"I couldn't get into my house because I had lost my key. "
- 我之前番唔到屋企, 因為戈刻之前唔見左條鎖匙.
可以發生係specific time, 可以唔係. 兩件事都發生係過去. 過去一件事件發生之前發生左另外一件事.

4. "I had been lost my key." WRONG


- - - - - - - - 用過第d例子 - - - - - - - -

1. Simple Past
"I lost weight."
"I lost 30 pounds in three months."
我減左磅. (之前重d, 依家輕左)

2. Present Perfect
"I have lost 30 pounds."
"I have lost 30 pounds in three months."
我之前到現在已經減左30磅.
發生係現在之前某一段時間. 幾耐之前唔重要.

3. Past Perfect
"I had lost 30 pounds before I got married."
依家已經結左婚. 係之前結婚前, 我減左30磅.
兩件事都發生係過去. 過去一件事件發生之前發生左另外一件事.

4. Present Perfect Continuous
"(Recently,) I have been losing weight."
前一陣子(時間唔重要)直至現在我一直減緊磅, 黎緊會繼續減.
有呢排/最近既意思.

5. Past Perfect Continuous
"I had been losing weight before I got married."
"James had been teaching at the university for more than a year before he left for Asia."
兩件事都發生係過去. 過去一件事件發生之前, 另外一件事正在發生(但之前某個時間已經完結).

3.i had been lost my key
這句子是有問題, 問題在於 "had been lost" 是被動式(passive voice)。
正確應這樣寫 : My key had been lost by me.
意思是 : 我的鎖匙是被我(或由我)遺失。

如果你要用主動式 "active voice"
應這樣寫 : I had lost my key. 用past perfect tense便可以。

has若是動詞, 用在現在式 he, she, it 的句語開頭
e.g.
He has a car.
She has an party tonight.
It has red in colour. ;
你可查字典 "have" have同has意思一樣是 "有" 的意思; 而 had 是它們的過去式

你的問題似乎要從新教你tense. lost是lose(失去)的過去式past tense.所以第一句I lost my key. [simple past tense] = 過了一段時間告訴別人(用past tense通常一天之後)「我(之前已經)失去了鑰匙」-是記述一件事實。 I have lost my key. [present perfect tense] = 在事件發生後短時告訴別人「我剛剛失去了鑰匙」。 I had lost my key. [past perfect tense] = 用past perfect tense是想表達某事情是在過去已經發生完了(在過去時間開始亦已經在過去時間完結-沒有再繼續了)才會用。對於失去鑰匙這類事件/情況只是一刻間(即是你只會有匙…沒有了/遺失了匙這個時間上單面[一點]的事)英語基本上不會用past perfect tense寫出來的。所以tense的形式作用是用來表達合理的情節。 I had been lost…[past perfect tense passive voice]是過去完成式的被動語態。意思是你(我)被遺失了…。因此lost之後不能是鑰匙或甚麼東西/死物。所以你寫的這句i had been lost my key是全錯，意義上不合邏輯亦文法結構錯。日常生活上你會聽到有人會講(有歌曲詞)I had been lost.或I was lost.意思是我過去曾經迷失/失去方向/迷途等等意思，留意意思依據上面說過去完成式的條件是是指那件事在過去發生延續但已經結束，而依據過去式的條件是指某定點的情況記述。所以就算這兩句類似的lost在意思上是有點分別的。I had been lost.意思重點是過去在一段時間我迷失過(意義上表達長時間的感覺)。I was lost.意思是過去我曾經迷失了(意義上表達迷失那事實)。 詳細和額外的解釋，希望幫助你重新明白英語的動詞和時態的作用。

VERB
lose (infinitive form) – lost (past tense) – lost (past participle)

Past simple
I lost my key. ~ active
I lost my keys. ~ active
Format: past tense

My key was lost. ~ passive
My keys were lost. ~ passive
Format: was/were + past participle

2014-03-04 06:12:34 補充：
Past perfect
I had lost my key. ~ active
Format: Had + past participle

My key had been lost. ~ passive
Format: had + been + past participle

Present perfect
I have lost my key. ~ active
Format: have/has + past participle

My key has been lost. ~ passive
Format: have/has + been + past participle

2014-03-04 07:19:02 補充：
Infinitive form – past tense – past participle
Have – had - had
Has– had - had

第三者單數 He, She, It, Mr Lee 在 Present tense 用 has
其餘用 have

I /You have a car.
He/She has a car.
I/You/He/She had a car. ~ past simple

He doesn’t (didn’t) HAVE a car.
He should/will/would/must/may/might HAVE a car.

2014-03-04 07:26:35 補充：
除了做 main verb 解 “有” “進行”, have/has/had 可做助動詞
I have lost my key.
He has lost his key.
I /He had lost my/his key.

He has had two accidents this week.
has ~ 助動詞
had ~ past participle (解 “有”)