however 通常引导一个让步状语从句,从句中的形容词或副词必须紧接其后。however多插在句中,有时也放在句首或句尾,但都应紧跟在进行对比的词或短语之后,用逗号将其与其他词分开。however是how的强调形式,通常含有惊讶、质问、气恼或感叹等意味。however可与but连用。

I'll come however busy I am.我不管怎么忙都会来的。
You won't be able to do it alone, however much you try.无论你多么努力,你一个人也做不下来。
She is helpless for the moment however bright a girl she is.不管她是多么聪明的姑娘,在这时也是没办法的。
Later, however, he made up his mind to go. 可是,后来他决定去了。
However, we need not discuss that now.可是我们现在不需要讨论那事。
The composition is all right, there is room for improvement, however.这篇作文还不错,不过还得改进。
However did you find it?你到底是怎样找到它的?
It's raining hard. However,I still want to go there.虽然下着大雨,我还是想去那儿。

But I am very much believable, however, you'll get him to come.我相信你不管怎样都能把他请来。
But however you do it, you will find it a difficult task.但是这件事无论你怎样去做,你都会发现很棘手。

however, but, how ever, no matter how
1.however是一个词, how ever是两个词,其中第二个词ever起加强语气的作用。
2.however和no matter how的意思都是“不管…怎样”,但前者为书面语; 后者多用于口语。
3.but和however用作连词时,都可以连接两个相反的观念和事物,但but所表示的是非常明显的对比,其连接部分必须是两个并列对等的成分; however是正式的用语,通常连接两个句子或作插入语用,是将后者和前者加以比较从而看出后者和前者意思相反。

［同义词］ adv. but, even so, still, though, yet