英语句型和英语时态的问题

英语句型和英语时态的问题
 Mary and my brother are to be married next year.
   玛丽和我的兄弟计划明年结婚.
这个句子能不能写成 Mary plan to marry my brother next year  或Mary is going to (这里换成will合适不合适) marry my brother next year
如果按照例句的写法, 玛丽和我的兄弟去年就结婚了  Mary and my brother were married last year.  玛丽和我的兄弟今天结婚      Mary and my brother are married today.
无论时间怎么变,按照例句的写法感觉都要写成married,不对的话这两句话怎么写
另外上次的句子我还不完全理解：
They often play chess after they have had supper
下面这句话怎么写,用上面的例句模板写用after,before连接的句型：我记得小时候做作业时喜欢先做数学作业,
They often play chess after they have had supper
对的话，同样是先后顺序，这里不用过去完成时态吗
I remember that I often did Chinese homework after math homework when I was a child.
还是did Chinese homework after had done math homework