時間狀語從句.
如：
Each time I see her，as is often the case，she is always wearing a smile
each time 有的，表示每一次……的時候(相當於when)Each time I see you，I will remember the happy time we spent together.每一次我見你，就會想起我們一起度過的快樂時光.
Each time，意思是每當做某事的時候，引導的時間狀語從句，例如，I bought a cup of tea each time I went out
