请看下面两句:
To get tickets, you have to book in advance. 你若想弄到票,你必须要提前预订。
To get into university you have to pass a number of examinations. 你如果想进入大学学习,你必须通过一系列考试。
请问句首的不定式是什么状语?是目的状语还是条件状语?请们解答一下,谢谢!