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.
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