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(shí)，but 是連詞。如： He is young but very experienced. 他雖年輕，但經(jīng)驗(yàn)很豐富。 He has three daughters but no sons. 他有3 個(gè)女兒，但沒有兒子。 He likes sports, but his wife likes music. 他喜歡運(yùn)動(dòng)，而他妻子則喜歡音樂。 2. however 表示“然而”、“可是”時(shí)，有的詞書認(rèn)為它是連詞，有的詞書認(rèn)為它是副詞。之所以將其視為副詞，也許是因?yàn)橄裨S多副詞一樣不僅能位于句首，而且能位于句中(注意前后使用逗號(hào))，甚至句末 (注意其前也用逗號(hào))。如： Later, however, he changed his mind. 可是他后來改變了主意。 He hasn't arrived. He may, however, come later. 他還沒有到，不過他等會(huì)兒可能會(huì)來。 He said that it was so; he was mistaken, however. 他說情況如此，可是他錯(cuò)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(cuò)了。 3. 當(dāng)連接兩個(gè)句子時(shí)，其前通常應(yīng)用分號(hào)，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(biāo)點(diǎn)的變化)。如： It's raining hard, but I think we should go out.