so that中间可以加adj+复数形式吗?

可以,这样的句子很常规,没有为什么的.
比如
There are so many students that quite often the cafetaria runs out of food.
上面句子 so 和 that 中间不是 adj + 复数形式,
many students 是 形容词短语.
但我可以举一个你说的 adj + 复数形式 的例句：
These diamonds are so rare that kings and princes have been known to bid high sums of money to own them.
rare （罕见,珍贵）是 adj
kings 和 princes 是复数名词
希望帮到了你,满意请及时采纳,谢谢.
我是加拿大人,前英语老师.