Question

为什么不能这么写，改英语病句？

both of our grandparents were not workers at the hotel

Answer 1

Both of our grandparents were not workers at the hotel.

= Our grandparents were not both workers at the hotel.

此句语法没什么问题，只是 both 的首字母没有大写而已。

而且此句是部分否定，意思是：我们的爷爷奶奶/外公外婆不都是旅馆的从业者。

Answer 2

Both of our grandparents were not workers at the hotel.

= Our grandparents were not both workers at the hotel.

此句语法没什么问题，只是 both 的首字母没有大写而已。

而且此句是部分否定，意思是：我们的爷爷奶奶/外公外婆不都是旅馆的从业者。

Answer 3

否定一般不用both，用neither
然后workers at the hotel一般作主语，做状语一般用workers of the hotel

Answer 4

……这是否定句……
不用both用neither