题目内容：

bill's and sam's project ____about yogurt
写错了bill's and sam's projects ____about yogurt。用are both 还是both are

优质解答

bill's and sam's project __are__about yogurt
bill's and sam's因为两个人名都加了's这说明是两个不一样的 所以主语不是单数 be动词要用复数
bill and sam's project __is__about yogurt
这样就是is了