ut与however的区别
区别一
表示转折时,but 是连词.如：
He is young but very experienced.他虽年轻,但经验很丰富.
He has three daughters but no sons.他有3 个女儿,但没有儿子.
He likes sports,but his wife likes music.他喜欢运动,而他妻子则喜欢音乐.
区别二
however 表示“然而”、“可是”时,有的词书认为它是连词,有的词书认为它是副词.之所以将其视为副词,也许是因为像许多副词一样不仅能位于句首,而且能位于句中(注意前后使用逗号),甚至句末 (注意其前也用逗号).如：
Later,however,he changed his mind.可是他后来改变了主意.
He hasn’t arrived.He may,however,come later.他还没有到,不过他等会儿可能会来.
He said that it was so; he was mistaken,however.他说情况如此,可是他错了.
注：以上各例中的 however 不能换成 but,但可用 but 来改写.如：
He said that it was so,but he was mistaken.他说情况如此,可他错了.
区别三
当连接两个句子时,其前通常应用分号,或另起新句.如：
It’s raining hard; however,I think we should go out.
It’s raining hard.However,I think we should go out.
雨下得很大,但我想我们还得出去.（from www.yywords.com)
注：上例中的 however 不能换成 but,但可用 but 来改写 (注意所用标点的变化).如：
It’s raining hard,but I think we should go out.
