you may have all those that remain.

1.remain在此句中是定语从句that remain的谓语.
2.该句主干是：You man have all those.
定语从句that remain修饰先行词those,且关系代词that代替先行词those在定语从句中充当主语.
翻译：你可以拥有所有的那些剩余的(东西).
3.补充如下：remain是不及物动词,就像happen/appear一样,它不能用于被动语态.此题如果使用leave的话,才可以用被动语态.