“成为同学”用英语怎么说

问题描述:

“成为同学”用英语怎么说
不能用BECOME CLASSMATES这样的CHINGLISH
那我的老师说我写的一句“two years later we became classmates and shared two precious years”这一句的became有问题,
注:这是正式文件

two years later we became classmates and have shared two precious years togather
我觉得问题不是出在前面,而是后面的时态
前面我觉得就应该用became
另一种说法是turned into classmates