those are his brothers改为单数句

those are his brothers改为单数句？

Those are his brother s。那些是他的哥哥们。这句话变单数句，those那些，它的单数是that那。are是，它的单数是is是。his他的，是形容词词性物主代词，它本身就是单数了，所以不变。brother s，哥哥们，它的单数是brother，句中可数名词单数前要加a／an。但它前面有his了，就不用加a了所以这句话的单数句是，That is his brother 。那个是他的哥哥。

Those are his brothers.那是他的兄弟。这是个复数句，要改成单数句，原句的主语those要改成单数形式that,be动词are要变成单数形式is,his保持不变，brothers是复数，要变成单数形式，要把s去掉，即brother。改好的单数句是:That is his brother.