while引導的從句
　　while除了有“當/在……時候”的意思外(注意：引導的句子謂語動詞只能是延續性動詞!)，另外的兩層意思也是考查的重點：(1)while = although “盡管”、“雖然”，引導讓步狀語從句;(2)while的意思是“然而;可是”，常用來表達對比關系。
　　[例句]
　　While I admit that the problem is difficult, I don’t think that they can’t be solved.
　　盡管我承認這個問題很難，但是我并不認為無法解決。
　　While I admit his good points, I can see his shortcomings.
　　雖然我承認他的優點，我也能看出他的缺點。
　　While I was angry with her, I didn’t lose my temper.
　　雖然我很生氣，但我當時沒有對她發脾氣。
　　While I understand your viewpoint, I don’t agree with you. 雖然我了解你的見解， 我還是不能同意(你)。
　　I earn only 120 dollars a week, while she earns 180 dollars. 我一星期只賺120美元，她卻賺180美元。