GRAMMAR IN USE.

Present perfect : 一件事情(在以前的任何事段)已經完結, 就用present perfect.
假設parents' day, 先生告訢David 的父母
e.g. David has done well in the first term. 這句句子，沒有特定指明David在那時段時間做得好，只知道David曾經做得好。

Present perfect continuous : 在過去的一段時間內一直在做一件事情。
e.g. David has been doing well in the first term. 這句意思是David 一直都表現得好， 較清楚地表達了時間(一直)，相對第一句給人的印象更好。

Past perfect: 一件事情在另一件事情前己經做完
e.g. He had taught Henry before he taught Robert. 意思是他教Robert前己經教了Henry.

Past continuous: 一件事情在另一件事情前一直在進行中
e.g. He had been searching for infomation before he wrote his report. 在他寫report以前他一直在找資料。

Past perfect 是強調在做B前己經做了A; Present perfect 就只告訴別人你做了B(only one thing is reported)

Have got= 己經有/得到; Have 有/得到

在決定用咩tense之前，記得留意時間和先後次序ar!! =]

Hope i can help you ^^

tense 主要分為幾種~
現在式- simple present tense (verb) I / you/ they唔洗加s, He/ she / it 要加s, 因為係third person singlar, 第三身單數
ex: I go to do shopping everyday.
點解會用go, 咩都唔洗轉呢, 因為這是true for long time 或者all time 既事實, 不會變改的,又或者人地問你, where are you from? 一定是答i m from hk, 而唔會係 i was from hk, 因為你係香港人,永遠都係, 唔會改變的. 所以就用現在式.

過去式- simple past tense (verb, past tense)
ex: I went to the beach with John just yesterday.
呢個比較易明, 因為是以經發生的事, 所以要用past tense, 但係通病就係一般人都比較懶, 唔肯背時式表, 有d 動詞後面唔一定係就咁加ed, 呢個要你自己研究一下了

現在進行式- present continous tense (is am are + verb + ing)
ex: What's john doing down there? Oh, he is repairing his bike.
呢個都係比較易明, 只係用係動作進行中既時候. 但係~~ 一般人都會忽略佢重有另一個用法, 就係present continous tense 亦都可以意味將來以經預料會做的事
ex: Hei, Mary, i just wanna tell you i am going to john's house to stay overnight next Sunday, can i?
這是你原本以經計劃好的事, 將來亦會發生.

過去完成式- past perfect tense (had+ pp)
ex: When i came back home, John had cooked tea already.
呢個時式你要用一把間尺方便自己啦~ 尺中間代表現在~now, 前少少就係過行式past tense, 再前d 就係past perfect tense 啦, 點解呢, past perfect tense 係一定用黎說明比過去更早發生既事情, 像剛剛的例子, 當我回到家, John 以經煮好茶.

過行進行式- past continous tense (was were + verb + ing)
ex: What were you doing at 8 last night? oh, i was taking shower
呢個係用係過去某段時間, 發生緊既事情, 不是太難的

現在完成式- present perfect tense (has, have + past participle)
ex: How long have you been in Australia? Oh, i have been in here for 2 years already.
呢個時式係用係從過去發生到現在, 而將來亦都會發生既動作, 就像例子, 你來了澳洲多久? o~我宜經來了這裡兩裡了, 當然, 我會繼續係澳洲, 所以就要用present perfect tense 啦.

現在完成進行式- present perfect continous tense (has, have + verb + ing)
ex: How long have you been smoking for? eh~~ i hav been smoking for a year already.
呢個時式同現在完成式非常相似, 但係當你明白到呢個時式既時候, 你會發現那一個比較貼切, 基本上, 你答i have smoked for a year already, 都係冇問題的.


Future tense- 將來式 (will + verb)
將來式明顯是用黎說明將來會發生既事, 但係, 將來式跟現在進行式的意思卻有所不同~
ex: john dropped down his pencil carelessly, and he was gona pick it up, but suddenly, i said, i d pick it up for you, which mean john didn't expect me to pick up his pencil for him.
意思說明了~ 將來式亦意味著不是本人預期會發生的事或動作.


希望幫到你吧~^.^