你用了which这应该是一个从句吧,假设前面还有一个主句的情况下,从句可以写成：
which can support us no matter how difficult the problem we confront becomes.confront 和 becomes 不是两个谓语动词了吗？how difficult the problem we confront becomes

we confront, 定语从句，修饰the problem,

这里的主句是how difficult the problem becomes.


becomes是和前面的problem构成句子的。