but 與 however的用法區(qū)別

兩者均可表示轉(zhuǎn)折或?qū)Ρ?，意?ldquo;但是”、“可是”、“然而”等，但有區(qū)別：

1. 表示轉(zhuǎn)折時，but 是連詞。如：

He is young but very experienced. 他雖年輕，但經(jīng)騐很豐富。

He has three daughters but no sons. 他有3 個女兒，但沒有兒子。

He likes sports, but his wife likes music. 他喜歡運動，而他妻子則喜歡音樂。

2. however 表示“然而”、“可是”時，有的詞書認爲它是連詞，有的詞書認爲它是副詞。之所以將其眡爲副詞，也許是因爲像許多副詞一樣不僅能位於句首，而且能位於句中(注意前後使用逗號)，甚至句末 (注意其前也用逗號)。如：

Later, however, he changed his mind. 可是他後來改變了主意。

He hasn't arrived. He may, however, come later. 他還沒有到，不過他等會兒可能會來。

He said that it was so; he was mistaken, however. 他說情況如此，可是他錯了。

注：以上各例中的 however 不能換成 but，但可用 but 來改寫。如：

He said that it was so, but he was mistaken. 他說情況如此，可他錯了。

3. 儅連接兩個句子時，其前通常應用分號，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，但我想我們還得出去。

注：上例中的 however 不能換成 but，但可用 but 來改寫 (注意所用標點的變化)。如：

It's raining hard, but I think we should go out.