next+时间名词；前不可加任何介词

the next +时间名词；前可用适当介词（也可省略）

next+以现在为标准的时间：即当谈到紧接着眼前这一周这一月这一年的下一周下一月下一年.

eg:I shall have been in thee army for fully three years by July next year.

the next+以过去或将来为标准的时间：即当谈到紧接过去或将来的某一周某一月某一年的下一周下一月下一年.

eg:The forign guests spend the first week in Beijing and the next week in Shanghai.

还有一点,