one of your family members who is 里面为什么用who is 不用 who are 呢.还有 the only one of your family members that are 为什么用are不用is呢
问题描述：
one of your family members who is 里面为什么用who is 不用 who are 呢.还有 the only one of your family members that are 为什么用are不用is呢.感激不尽~
答
第一句里的主语是one ,也就是你家庭成员的其中一员才是主语,所以用单数 is
第二句里的that 后面的这个句子是修饰members的,所以用are