求教英语问题，areto结构

we must both increase our marketability and advertise our services more aggressively if we are to remain competitive. 后面这个we are to remain competitive我看不懂啊，
是什么结构啊

be +不定式有三个意思：
1. 是：Her job is to clean the room.
2. 应该：He is to be responsible for the accident.
3. 准备、打算，计划：We are to take a trip to Qingdao next week.
be +不定式是系表结构，不定式作表语。
...if we are to remain competitive. 。。。。。。如果我们想要保持竞争力

be to do 表示即将干某事，将来时态的一种。

现在表将来，虚拟语气

be to也就是这里的are to解释为将要做

be to do sth. 标示将来时态

你好！ be to do 表将来时 仅代表个人观点，不喜勿喷，谢谢。