theory可数吗?如果可数,怎么变复数啊?急等

theory是可数名词，把y变i加es，即theories；
theory：n、学说;论;说;理论;原理;原则;(未证明的)意见;看法;推测。
theories：n、学说;论;说;理论;原理;原则;(未证明的)意见;看法;推测。

His theories mesh together various political and religious beliefs、

他的理论把各种政治和宗教信仰完美地结合起来了。

His theories are open to dispute、

他的、理论值得商榷。

His theories have been debunked by recent research、

最近的研究揭穿了他的理论的真相。

The theory has been superseded by more recent research、

这一理论已为新近的研究所取代。

I have this theory that most people prefer being at work to being at home、

依我看，多数人喜欢工作而不愿待在家里。

The parison shows considerable disagreement between theory and practice、

这一对比表明理论和实践之间有相当大的出入。