They've been together for five years and are almost married, though not officially wed.

almost 是副词，意思是"几乎、差不多"，表示接近某种状态但尚未完全达到。 married 是形容词，意思是"已婚的"，描述婚姻状态。 almost married 这个短语表示"几乎已婚"，指虽然没有正式结婚，但关系已经非常接近婚姻状态。