Why don't you buy an MP4 for you daughter (改为同义句）———— ————buy an MP4 for your daughter?———— ————buying an MP4 for your daughter?

Why don't you buy an MP4 for you daughter (改为同义句）———— ————buy an MP4 for your daughter?———— ————buying an MP4 for your daughter?
Why don't you buy an MP4 for you daughter (改为同义句）
———— ————buy an MP4 for your daughter?
———— ————buying an MP4 for your daughter?

Why don't you buy an MP4 for you daughter (改为同义句）———— ————buy an MP4 for your daughter?———— ————buying an MP4 for your daughter?
—Why——— ——not——buy an MP4 for your daughter?
——How—— —about———buying an MP4 for your daughter?

—Why——— ——not——buy an MP4 for your daughter?
——How/What—— —about———buying an MP4 for your daughter?
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Why not
How/What about