[論文寫作] had been V p.pand have been + V-ing

範例解說：取自網路

2000-------------2005-------------2010-------- 
....had been....+met husband 

Ex: I had been single for five years before I met my husband. 
在我遇到我老公之前, 我已經單身五年了. 
當你在講過去一段時間所發的事情時, 你用had been - 事實已不存在(因為我已經不是單身了) 


has/have been+ ving- 現在完成進行式 

has - 第三人稱/ have - 第一二人稱 

2000-------------2005-------------2010-------- 
+ became a teacher .....still a teacher... 
Ex: I have been teaching for five years. 
我已經教書五年了 
當你在講一件事, 過去發生, 現在還在進行, 就用has/have been.因為我現在還在教書