susanwangyue
Tom and Jack's mum.共有时只在最后那个物体后加'STom's and Jack's mum.表示Tom的妈妈和Jack的妈妈,是不共有的.不共有就在两物体后都加'S一定要相信哦!!!!!!!!!!!!~~~~~~~~~~~是书上都有的
moncherisii
Lucy和Lily的妈妈指共同的妈妈时 是 Lucy and Lily's mother指各自的妈妈时是Lucy's and Lily's mothers如Lucy and Lily's mother is a doctor.Lucy's and Lily's mothers are doctors