Tense

首先講解一下咩係 present continuous tense...

現在進行式:
現在發生的事情,通常有is/am/are,後面的動詞加ing,會有look out,now作提示..
例如:
Look out, the car is coming!
She is crying now.
Listen, the teacher is talking.
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兒家講解一下咩係 past continuous tense...

過去進行式:
過去發生的事情(例如昨天當我做緊功課時,佢玩緊..)通常有was/were,後面的動詞都係加ing,會有D詞語表達是昨天或過去的事情..
例如:
Yesterday,I was cooking.
I remember that we were playing last year.

XDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD

兒家再講解一下咩係present perfect....

我自己都唔知點解釋...TAT
通常用has/have/had+關鍵字,後面的動詞變成present perfect

關鍵字:
just(剛剛)
already(完成)
yet(還沒)
for(用了*通常用於時間)
since(由)....

例如:
She has just gone←(present perfect).她剛剛走了.
He has already drunk←(present perfect) the milk.他喝完奶了.
Dorothy has not done←(present perfect) her homework yet/Dorothy has not yet done←(present perfect) her homework.多路非(XD)還沒做完功課.
等..
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Hope I can help you!!!!
My name is Dorothy XD
寫字很辛苦~

I love Super Junior!!!!!

2013-06-06 16:31:12 補充：
是還沒做功課....
sorry!~

present continuous tense 如果有is\am\are\now加ing

past continuous tense 如果有was were加ing

present perfect如果有has been \have been

What do you mean by 關鍵字?
Do you actually mean:
Present continuous: is/am/are + ing 而家發生緊嘅事
Past continuous: was/were +ing 當時發生緊嘅事

Present perfect: has/have + past participle (即係do did done個done)

我估你問的關鍵詞是問如何認出這兩種時態的用詞:
VERB=動詞

present continuous tense
I am VERBing
He/She/It is VERBing
You/They are VERBing
中文叫現在進行式
意思是描述VERB的動作是正在進行...繼續緊

past continuous tense
I was VERBing
He/She/It was VERBing
You/They were VERBing
意思是描述VERB(1)的動作是在以前發生過，而當時是有進行了一段時間
通常這時式是用於複句子中表示另一動作VERB(2)是在這段時間/情況中間出現/發生了。
記述過去事件/歷史/說故事:
past continuous tense
[VERB(1)..........................ing]
在這VERB(1)進行中的時間裏
VERB(2)(past tense)發生
描述一些相對的事件

present perfect tense
I/You/They have VERBed(past participle)[過去分詞]
He/She/It has VERBed(past partciple)
已完成或相對地剛發生了的VERB動作/情況

past perfect tense
I/You/They had VERBed(past participle)
He/She/It had VERBed(past participle)
寫故事/記錄/描述已經發生了的
已完成或當時相對地剛發生了的VERB動作/情況

Present Continous Tense:
"am/is/are"+"(verb)ing"
2 kinds
1. happening
for example: i AM HAVING lunch now.
*key word: now, at this moment
2. planned
for example: i AM GOING to Los Ageles tomorrow.

Past Continous Tense:
"was/were"+"(verb)ing"
things happened together in the past
2 kinds
1. both things were long action
for example: i was having a shower while my mum was cooking.
2. one short one long
for example: when i was walking, i met my primary classmate.
*key word: while, when, as

Present Perfect Tense
*key word: "has/have"+"(verb's past participle過去分詞)[seen, done, gone]"

hope i can help u la:)