句型转换（变否定句）
问题描述：
句型转换（变否定句）
1.The boys are listening to music.(变否定句）
The boys _____ _____ to music.
答
aren't ,listening
句型转换（变否定句）
1.The boys are listening to music.(变否定句）
The boys _____ _____ to music.
aren't ,listening