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Lesson 15
When he came I was singing.
他来的时候我在唱歌。
“when”当……时候“while”在……时候“once”一旦“though”虽然“if”如果……这些连词引导的副词从句如果它的主语跟主句的主语一致，那么这些从句可以变成分词短语。
When I saw，her I felt happy.
When seeing her，I felt happy.
当我看到她的时候我感到高兴。
While I was in Beijing，I had a good time.
While in Beijing，I had a good time.
我当时在北京过得很愉快。
When I’m unhappy，I don’t feel like talking.
When unhappy，I don’t feel like talking.
当我不高兴时，我不想说话
