翻译句子“到去年年底，他们已经结婚10年了”请帮忙分析一下时态还有marry的用法

By the end of last year, they have been married for ten years marry既可用作及物动词，也可用作不及物动词，意为结婚；嫁；娶；与......结婚等。常见用法如下： 一、marry sb表示嫁给某人；与......结婚。例如： John married Mary last week.上星期约翰和玛丽结婚了。 二、be/get married to sb表示与某人结婚。例如： Jane was married to a doctor last month. 上个月简和一位医生结婚了。 Rose got married to a teacher.罗斯和一位教师结婚了。 三、marry sb to sb表示父母把女儿嫁给某人或为儿子娶媳妇。例如： She married her daughter to a businessman.她把女儿嫁给了一位商人。 四、marry作不及物动词时，往往用副词或介词短语来修饰。例如： She married very early. 她很早就结婚了。 五、marry 一般不与介词with 连用。例如： 她和一位英国人结了婚。 【误】She married with an Englishman. 【正】She married an Englishman. 【正】She was / got married to an Englishman. 六、若问某某是否结婚，而不涉及结婚的对象，可用be / get married的形式，相当于系表结构。例如： 你结婚了吗？ 【误】 Do you marry?/ Have you married? 【正】 Are you married?/ Have you got married?

By the end of last year, they had been married for ten years. 过去完成时态， marry sb.是动作 be married是状态

(截止到) 到去年年底，他们已经结婚10年了 They had been married for 10 years by the end of last year. 要用过去完成时, "到去年年底"是过去式, 而他们结婚10年是发生的去年年底之前, 所以是过去的过去, 即过去完成时. 另, 结婚是瞬间动词, 要用be married 来表示已经结婚了的状态,持续了10年. 若有疑问及时追问，如满意请点击下面的“选为满意答案”按钮，谢谢！O(∩_∩)O

They had been married for ten years by the end of last year. 到过去某个时候为止，动作已完成，用过去完成时。 marry为非延续性动词，可以用完成时，但不可与“一段时间”，包括how long 连用。如： He has married .为正确句子。 如出现一段时间，须用marry的状态be married表示。就像你的问题。