可以变成Coffee beans mixed can produce.
此句把Coffee beans were mixed合二为一,用mixed(分词形式)做Coffee beans的后置定语（表被动）.此时Coffee beans mixed就变成了一个主语从句.其后只需接相应的谓语动词即可.
主语从句怎么变?比如Coffee beans were mixed咖啡豆混合起来可以产生.这个句子怎么说?
可以变成Coffee beans mixed can produce.
此句把Coffee beans were mixed合二为一,用mixed(分词形式)做Coffee beans的后置定语（表被动）.此时Coffee beans mixed就变成了一个主语从句.其后只需接相应的谓语动词即可.