赖世雄教你学英语语法
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5-11：however的结构变化
however做连接副词所引导的副词从句中，主语之后若含有be动词+形容词时，同学要特别注意下列结构变化：
例：however poor he is,he won't count on anyone to help him.
=however poor he may be,he won't...
=be he ever so poor,he won't...
（不论他多穷，他都不会依赖别人来帮助他。）
同理：however interesting this book is,i don't like it.
=however interesting this book,may be,i...
=be this book ever so interesting,i...
（不论这本书多有趣，我都不喜欢。）