Dr Coach 英語知多D(10) - 分辨 When 及While 的用法

細個讀書時，好多老師都會教你When和While是一樣的
都是用來表達兩件事情同事發生，但又是否完全一樣的呢？

用作連接詞: 
I was sick when I was studying.
I was sick while I was studying.

用作開首，記得加逗號

When I was studying, I was sick.

While I was studying, I was sick.

以上是最基本的用法

其實While還有另一種用法

就是用來作比較

例如:
Peter is smart while Mary is patient.
(Peter 很聰明，而 Mary很有耐性)

Dr Coach serves 24-hours daily while tutorial centers serve at the fixed time, for a fixed duration.
(Dr Coach 24小時運作，而補習班則固定了服務時間及服務長度)


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