She had brain cancer and only have 135 days to live.为什么用to live
问题描述：
She had brain cancer and only have 135 days to live.为什么用to live
答
这里live的动作是主语She要做的，所以用主动句式have sth. to do。
答
她患有脑癌,只能活135天了.to 表示趋势或倾向或表示应该或必须含义的句式,