1、what are you doing？意思是你在幹什麼？
2、例句：（1）what are you doing，mon？I need your help.你在幹什麼媽媽？我需要你的幫助。（2）what are you doing？How can you see?你在幹什麼？你怎麼能看得見？
3、what are you doing？是特殊疑問句，what are you後要加動詞的ing形式。例如：（1）What are you drinking?你在喝什麼呢？（2）What are you waiting for？你在等什麼？
