the next week第二周,次周;
the + next + week/year/month表示第二……,次……:常用来指过去接下来的……
如:
He said that he would go home the next week.
所以下周是不用加the的
next month/year也是这样.
习惯上在名词前有that,this,last,next等词时是不用加介词的.但现代英语中也有的人加了.
In that case the roof is going to cave in next week.