1).the difference between 'next year'and 'the next year'?2).How to read 2.50$?

So That用法
1) so that (在结果状语从句中) 以致;结果
eg: He didn’t plan his time well, so that he didn’t finish the work in time.
The lift was out of order, so that we had to walk to the 10th floor.
2) so that (在目的状语从句中) 以便
eg: Would/Could you speak slowly so that everyone can hear you?
They set out/start off early (so) that they might arrive at the airport/airfield in time.
3) so that 引导的目的状语从句和结果状语从句的区别在于:
① 用so that 引导的结果状语从句中, 无情态动词, 而在目的状语从句中则有.
eg: I sent/posted this letter by air mail, so that he received it in good time. (表示结果, 是结果状语从句)
I sent/posted this letter by air mail, so that he could receive it in good time. (表示目的,是目的状语从句)
② 用so that 引导的结果状语从句不可置于句首, 而目的状语从句可.
eg: So that /In order that they could catch the first bus, they got up early this morning. (目的状语从句, 可置于句首)
The policeman waved to the driver, so that he stopped his taxi/cab. (结果状语从句，不可置于句首)
4） so+adj./adv.+that 如此