同义句是：How about watching English-language videos?或者：What about watching English-language videos?同时指出楼主的一点小问题：句子中don't后应该加个主语,如don't you,不然整个句子缺少主语有语法错误.当然也可以把don't换成not,组成“why not+动词原形”这样的句型,表示向某人提出建议.