why don't you go home now改为同义句是：Why not go home now。
Why not更常见的用法是用作说话人向对方提出一个建议，意思是＂何不＂。Why not句型与Why don't you/we句型为同义句型。注意Why not后面必须接动词原形，即Why not do。
英语中同义句更改方法：
1、运用同义词（组）进行转换
用同义词或同义词组对原句中的某些词或词组进行替换，注意转换后的词或词组的词形变化要与句子其他成分相适应。
The teacher always takes good care of the children in the school.
The teacher always looks after the children well in the school.
2、运用不同语态进行转换
即运用主动语态与被动语态的变化来转换同义词，但此时要特别注意时态、动词一致性。
Everyone should give back his library books on time.
Library books should be given back on time.
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