i have finished my homework，e 句句子係咩時式？

I have finished my homework. (過去的動件 - 無講明時間 - 係 present perfect tense)
I finished my homework 1 hour ago. (過去的動件 - 講明時間 - 係 past tense)

Present Perfect Tense
雖然是說及過去發生的事情，過去發生的動作，但郤不是 Past Tense！我們可以用上的時間副詞，就只有 "Already"，"Just"，"Yet"，"Since 1999"…etc。而不可以霸佔 Past Tenses 的時間副詞來用啊，如：Yesterday, Last week, three years ago…etc。亦因為有這個特點，所以很多人都會說：Perfect Tenses 都在不知道 Exact time 時用

1. 當說及一些事件發生於以前，並繼續進行至現在
I have lived/have been living in this house for years／since 1992.

2. 當強調一個動作我們做了多少次或發生次數
He has broken his arm four times before.

3. 我們會用 Present Perfect Tense 來表達一個較長久，永恆的事情

present perfect
i has been doing my homework
姐係佢之前做緊.e家重做緊

2007-11-14 01:36:47 補充：
係我i have beenhesheit先用has.

Present perfect

Present perfect: has/have + past participle

It's supposed to be used when that action has just happened. Something happened in the past but without specifying the time, date, etc.

For example:
I took a shower this morning/an hour ago/yesterday.
I have just/already taken a shower.

If there are 2 actions happening in the past and you wish to tell others than one action took place before the other, you use perfect tense for the action which happened first:

I have finished my homework before I watched television yesterday.

If you use the perfect tense to describe only one act - usually you wish to stress that the action has already taken place.

I have already told you this. Don't make me repeat it the second time.

it is present perfect tense.

the time finished in the past and have the result now.
eg. I have finished my homework
that mean you finish the homework in the past and now, the homework is finished(the work has done)