Sister brother的复数是

Sister brother的复数是 sister brother son daugher father mother parent 的复数形式 写出mather father this sister brother is 的复数形式. mother,father,brother,sister,friend,grandfather,grandmother改成复数形式能在8点半前回答的, 谁告诉我下面这些单词的复数形式mother this that sister brother parent brother的复数是什么 sister的复数形式 sister的复数是什么 They are sister and brothersister and brother为什么不用复数? brother-in-law 复数brother-in-law 的复数是brothers-in-law 写出下列单词的复数形式jeep map name number pen eraser brother grade row bird rulerfriend cat sister pear dog student phone clock desk mouse是复数形式哦 英语名词单复数On the other hand,as the only child in the family,they can’t enjoy the happiness from brother or sister.这里的BROTHER和SISTER可以用复数么?为什么 brother的复数形式是brethren还是brothers brother和sister之间的英语是什么? 请帮我看看下面哪句话是正确的?1.Does he have any brother and sister?2.Does he have any brother or sister? sister是姐的意思吗?brother哥哥的意思吗? family的复数是?it的复数是?boy的复数是?This her brother改为复数形式是?Those are my sisters改为 these are my brother and sister 里的brother和 sister要加s吗