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1. 然而;不过;仍然
You use however when you are adding a comment which is surprising or which contrasts with what has just been said.
2. (后接形容词或副词用于强调)不管怎样,无论多么
You use however before an adjective or adverb to emphasize that the degree or extent of something cannot change a situation.
3. 不管用什么方式;无论如何
You use however when you want to say that it makes no difference how something is done.
4. …左右;…上下
You use however in expressions such as or however long it takes and or however many there were to indicate that the figure you have just mentioned may not be accurate.
5. 究竟怎样,到底如何(用于强调地询问令人吃惊的事情;一些人认为此用法不正确,用how ever较为妥当)
You can use however to ask in an emphatic way how something has happened which you are very surprised about. Some speakers of English think that this form is incorrect and prefer to use 'how ever'.