grammer 一問

首先可以講o既係：第二句錯。因為 Jason 係第三身，動詞如果係 have 的話應該係變成 HAS。
1) jason has been fixing the annoying puppy.
呢句係用 present perfect continuous tense，意思係呢件事其實一直發生緊，講呢句o野o既時時候已經開始，依然未停。如果中譯就係：
Jason 一直在「修理」（即係教訓）那隻討厭的小狗。
用 present continuous 同呢個 tense o既分別係，present continuous 用於形容一件發生中o既事o既一個時刻o既狀態。例如，如果你依家見到 Jason，驚問佢做緊乜，佢就可以答：I'm fixing this puppy!
3) jason had been fixing the annoying puppy.
呢句係 past perfect continuous tense。用法有ｄ似 past perfect，先講左 past perfect 先：
當兩件舊事要一齊講，之間有個時間關係時，先發生o既就用 past perfect，較近o個件用 simple past。如：
The puppy had annoyed Jason before I was there.（隻狗激嬲 Jason 時我唔o係o個度）
好啦，隻狗激嬲左 Jason，咁 Jason 就出手啦：
Jason had been fixing the annoying puppy when I arrived.（我到o個陣 Jason 已經打緊隻狗仔）
一般用到 past perfect 或 past perfect continuous，都係有一個舊事o既背景，兩件事有時序關係先會用到。

第一句既Jason=he,所以用has.
解釋:賈森已訂定惱人的小狗。
第二句既grammar is wrong.
第三句係已經過去咗ga la.
總括：3句既分別就係tenses 唔同。
如果有錯，敬請原諒！！