【how可以引导定语从句吗】不能的'，关系副词在美国英语里只有三个：when、where、why.
【关于定语从句的引导词】
1when引导定语从句,在从句里作时间状语,先行词表示时间.如：
Tuesday is the day when the garbage truck comes.
2where引导定语从句,在从句里作地点状语,先行词表示地点,如：
I once again came to New York,where I hadn't been for ten years.
He and his family moved to Italy,from where he moved to Germany and went to university.
He has reached a point where a change is needed.
3why引导定语从句,在从句中作原因状语,先行词只有reason.
That's the reaon why I didn't go to college.
4how不能引导定语从句,它可以作疑问副词或缩合连接副词使用.如果先行词是the way,则可以用in which、that引导定语从句.如：
I don't know how I can solve the problem.
That is how he solved the problem.
That is the way in which/that he solved the problem.
