【評論主題】16. _____ in airplane before, the little girl was surprised and alittle frightened when her ears pop

【評論內容】可參考 http://to31401.pixnet.net/blog/post/14232729-%E7%AC%AC%E4%BA%8C%E5%8D%81%E4%BA%8C%E7%AB%A0-%E5%89%AF%E8%A9%9E%E5%AD%90%E5%8F%A5%E6%B8%9B%E5%8C%96

【評論主題】16. _____ in airplane before, the little girl was surprised and alittle frightened when her ears pop

【評論內容】副詞子句的連接詞中，before, after, since是身兼連接詞與介系詞的雙重詞類。減化時要注意：它會被視為介系詞，故後面只能接名詞類，必要時得加上being來作詞類變化。