英文的 tense

Past Perfect 過去完成式：過去的當然是完成的啦？其實是在過去中有很多事在很多不同狀態中。有些是與現在豪無關係，有些一直進行到現在，有些用以比較其他動作。

Past Perfect 比 simple past 的動作先作出的動作。
(即如果句子只有一個動詞，用 simple past 已可以了。)

e.g. I had finished my dinner already when my mother came home with some sandwiches.

for example: I had eaten an apple before I have eaten dinner.
在present perfect tense之前用before or 在past tense之前用before

又或者

indirect speech 轉做reported speech的時候
for example:
1. 'Tom ate an apple yesterday' , Ada told my mother.
轉
Ada told my mother that Tom had eaten an apple the day before.

2. 'Tom has eaten an apple', Ada told my mother.
轉
Ada told my mother that Tom had eaten an apple.

past prefect tense 係用於 過去發生既一個action..而且有指明時間性的

example:

i had been eaten five apples in the garden during the summer holiday

我係暑假既時候, 係菜園入面食左5個蘋果

↑指明既時間性 ↑過去發生左既一個action

past perfect tense=過去完成式！
例如你問人係係做完某件事個陣就問
Had you done ........?
多數咁用