祈使句不可能用过去式或过去分词作谓语的。

said应为It is said that或They said that的省略形式，为口语形式。翻译为“据说”。

Said cavalry consisted of exactly two people: Marie Law-son, a tiny blonde with rectangular glasses, and her chunky (to put it charitably) boyfriend, Will. 

据说骑兵队由二个人组成：玛丽罗森，一个戴着方框眼镜的小个子金发女孩，以及她矮胖的男友比尔。