We can know from the book the air is very fresh 这句话有没有问题如果要改成我们可以从书中知道以前的空气是很新鲜的怎么改
问题描述：
We can know from the book the air is very fresh 这句话有没有问题
如果要改成
我们可以从书中知道以前的空气是很新鲜的怎么改
答
We can know from the book that the air is very fresh
答
没有问题。
We can know from the book that the air was very fresh before.
答
没有的,可以在book后加上that,但这个是可以省略的.from the book 的位置可以放句首或者句末.句子意思不变：我们可以从书中得知空气是很新鲜的. We can know from the book that in the past the air there was very ...