# however与but 的用法区别#

两者均可表示转折或对比，意为“但是”、“可是”、“然而”等，但有区别：

1. 表示转折时，but 是。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。

2. 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。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。

3. 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。

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.