究竟 Perfect tense 幾時用ga? (10 points!!)

Simple past tesnse:當句句子係講述一件動作既時候，如果有明確的時間提供(yesterday, last month, an hour before..)我地就用簡畢過去式。
***例句=She bought me a Christmas present yesterday.
Perfect tense:當一句句子講既動作..第一:無明確時間俾到你..第二:個動作延續到現在，還未完結，第三:係我地講之前已經完結左 即刻個action岩岩先finished
正如你所講...Perfect tense都有分類..你睇下下面既例句..=]

Present perfect: 就係我上面講過既其實都已經可以用present perfect
***例句=I have already taken my supper.
Past perfect: 係當一個人講佢係另一件事之前已經做完左第二件事
***例句=Before mum came back home, i had already finished doing my assignment.
Perfect continues:當一個action係一段長時間進行
***例句=I have been watching TV for the whole day.

Passive Voice: 就係被動句，但係被動句之中用perfect tense係少見..多數都係咁既format:
***例句=I was being taught by my teachers.

Matters concerning "if..then..":
1)當一件事係事實...我地就兩個verb都用present tense
***例句=If an ice is exposed to the sun, it melts.
2)當一件係有可能發生既事...我地就用future tense
***例句=If I can finish my homework on time, my mum will let me play PS3.
3)當一件係完全無可能發生既事..我地就用past tense
***例句=If i were you, i would buy a houuse for my parents.
"注意..係第三個情況底下...I 係用 were."


有無分加都無咩所謂
希望真係可以幫到你=]

IMPORTANT No Future in Time Clauses
Like all future forms, the Future Perfect Continuous cannot be used in clauses beginning with "when," "while," "before," "after," "by the time," "as soon as," "until," "if" and "unless". In this lesson, all verbs in Time Clauses are italicized.
EXAMPLES:
I won't tell the student the answer until he has been working on the math problem for more than an hour. Correct
I won't tell the student the answer until he will have been working on the math problem for more than an hour. Not Correct________________________________________
FORM Future Perfect Continuous
[WILL HAVE BEEN] + [VERB+ing]
EXAMPLE:
I will have been waiting for two hours when her plane finally arrives.
[AM / IS / ARE] + [GOING TO HAVE BEEN] + [VERB+ing]
EXAMPLE:
I am going to have been waiting for two hours when her plane finally arrives.
NOTE: It is possible to use either "will" or "going to" to create the Future Perfect Continuous with little or no difference in meaning________________________________________

USE 1 Duration Before Something in the Future

We use the Future Perfect Continuous to show that something will continue up until a particular event or time in the future. "For five minutes," "for two weeks" and "since Friday" are all durations which can be used with the Future Perfect Continuous. Notice that this is related to the Present Perfect Continuous and the Past Perfect Continuous, however the duration stops in the future.
EXAMPLES:
They will have been talking for over an hour by the time Tony arrives.
She is going to have been working at that company for three years when it finally closes.
James will have been teaching at the University for more than a year by the time he leaves for Asia________________________________________USE 2 Cause of Something in the Future
Using the Future Perfect Continuous before another action in the future is a good way to show cause and effect.
EXAMPLES:
Jason will be tired when he gets home because he will have been jogging for over an hour.
Claudia's English will be perfect when she returns to Germany because she is going to have been studying English in the United States for over two years.
IMPORTANT
If you do not include a duration such as "for five minutes," "for two weeks" or "since Friday", many English speakers choose to use the Future Continuous. There is also a difference in meaning. Compare the examples below.
EXAMPLES:
I will be reading when my roommate returns.
The reading will be interrupted.
I will have been reading for an hour when my roommate returns.
The reading will stop just before my roommate returns. ACTIVE / PASSIVE Future Perfect Continuous
EXAMPLES:
The famous artist will have been painting the mural for over six months by the time it is finished. ACTIVE
the mural will have been being painted by the famous artist for over six months by the time it is finished. PASSIVE
NOTE: Passive forms of the Past Perfect Continuous are not common.

Let me give you some hints. ^_^
e.g.
1a) I slept well last night.
1b) He went to Ocean Park last summer.
2a) present perfect tense: She has done the project well.
2b) past perfect tense: The man had stopped smoking long time ago.
2c) present perfect continuous tense: I have been drinking coffee for 5 years.
3a) The only difference is: has/ have/ had + 'been' + p.p.
e.g. The lazy boy has been asked by the tutor to be punctual to school for several times.
3b) I don't understand your question, sorry.