帮我把以下句子翻译成英文

Because my Grandfather is having a bad disease (illness), and he might pass away at any minute, the date (that) I (am going to) return to China is not expectable. It is really hard to tell when his condition gets worse.

pass away 逝世，（其实老外对生死看得比较淡薄，因为信教，相信死后会上天堂，所以还好）前面有 because 了中间不要加 so 哦！
is having 用进行时，用过去时说明病已经结束了（不是好了，就是...）
病情用 condition 就可以了。

最好能说出病的名字 代替 disease。

"Because my grandfather had a very serious illness, dying soon, so I return to the days when not expected, the deterioration of the disease is difficult to accurately say"

"My grandfather is dying due to his illness, so I'm not sure when I need to go back to China... because exactly when he will go... is hard to say..."

这个翻译并不是很准确的书本翻译，用于口语比较适合，因为比较婉转而且比较容易说，又没有缺少你主要想要表达的意思。

My grandfather's badly ill, so I am afraid that when I will return from abroad could not be sure. You know, the state of an illness is quite hard to pred