用 how much 多么地想
I can't say how much I want to see you again.It's two years since I saw you last.
我无法用言语表达我是多么地想再次见到你.上次见你都是两年前的事了.
How often 是多久一次的意思,不符合题意.
How often do you hear from your sister?你多长时间接到你姐姐一次信?