他來的時候我在唱歌。
“when”當……時候“while”在……時候“once”一旦“though”雖然“if”如果……這些連詞引導的副詞從句如果它的主語跟主句的主語一致,那么這些從句可以變成分詞短語。
When I saw,her I felt happy.
When seeing her,I felt happy.
當我看到她的時候我感到高興。
While I was in Beijing,I had a good time.
While in Beijing,I had a good time.
我當時在北京過得很愉快。
When I’m unhappy,I don’t feel like talking.
When unhappy,I don’t feel like talking.
當我不高興時,我不想說話