They were both of middle height和they are both of middle height的区别they were both of middle heightthey are both of middle height意思好像是一样的,哪么什么时候用were什么时候用are呢?

They were both of middle height和they are both of middle height的区别
they were both of middle height
they are both of middle height
意思好像是一样的,哪么什么时候用were什么时候用are呢?

表示过去用were,他们以前算中等个,现在可能不是.
表示现在用are.他们现在算中等个.

说过去时用were
说现在时用are
时间的不同而已

were 是 are的过去式，就是以前 后者是现在。