我能按照要求改写句子.
问题描述：
我能按照要求改写句子.
i'm doing an experiment.(改写为一般疑问句）
———— ———— doing an experiment?
wu yifan and amy are collecting leaves.(对are collecting leaves部分提问）
———— ———— wu yifan and amy————.
They are piaying chess.(改为否定句）
They ——— ———chess.
答
Are you
What are doing
aren't playing