連線詞but和yet表示轉折或對照,意為“但是,然而”.例如： It"s true that he is young,but he is experienced and responsible. 誠然他很年輕,但是他有經驗,又認真負責. He is poor,yet he is clever and noble-hearted. 他很窮,然而人卻很聰明,心地又善良. Fortune often knocks at the door,but the fool does not invite her in. 幸運之神常光顧,痴人不知把門開.but和yet儘管都可譯為“但是”,但還是有區別的：
3) but在某些習慣說法中不可用yet替代.例如： This is strange and yet true.（正）這是奇怪的,但是真的. This is strange and but true.（誤） She is American but she speaks Chinese very fluently. 她是美華人,但她說中文說得非常流利.（自然輕鬆的比較或對立） She is American,yet she knows little about American history. 她是美華人,但她卻對美國曆史知之甚少.（較強烈的比較或矛盾） A:"Let"s have another try."讓我們再試一次. B:"But how?"但是怎樣試呢?（習慣表達法,不用yet） It is true that he is young,but he is diligent and honest. 誠然他年輕,但是他勤奮,而且誠實.（同it is true,of course,indeed等連用習慣上用but）Note:1.never…but意為when…always.例如： It never rains but it pours.不雨則已,一雨傾盆.2.在not such…but,so…but句型中,but相當於that…not.例如： He is not such a fool but he knows it. No task is so hard but (but that ) he can accomplish it.3.在 I do not doubt but (but that）,I do not deny but (but that),It is not impossible but (but that )句型中,but或but that無意義,相當於連詞that.4.only亦可用作並列連詞,意為,“但是,只是”,常用於口語中,相當於but,前面可用逗號或分號.例如： He has promised to do it,only he does not keep his word. 他已答應做那件事了,只是他不守信用.5.still可以用作並列連詞,意為“但是,然而”,前面用逗號或分號均可.例如： Autumn is come,still it is rather hot. 秋天到了,但是天氣仍然很熱. She failed; still she did not lose heart. 她失敗了,但她並沒有灰心.6.still,yet,however,nevertheless常可換用,however語氣較弱,常作插入語用；yet,still 和nevertheless常表示強烈的對比或相反的結論.例如： I can not,however,approve of your design.7.and yet和but yet是yet的變體,與but同義.轉折的表示法還有：indeed…but；It is true…but; to be sure…but; while,whereas (=but on the contrary) ; on the contrary; on the other hand等.例如： Some people like fat meat,whereas others hate it.
連線詞but和yet表示轉折或對照,意為“但是,然而”.例如： It"s true that he is young,but he is experienced and responsible. 誠然他很年輕,但是他有經驗,又認真負責. He is poor,yet he is clever and noble-hearted. 他很窮,然而人卻很聰明,心地又善良. Fortune often knocks at the door,but the fool does not invite her in. 幸運之神常光顧,痴人不知把門開.but和yet儘管都可譯為“但是”,但還是有區別的：
1) but是並列連詞,而yet則可作並列連詞或副詞,不可說and but,但可說and yet,but不可放在句尾,而yet可放在句尾；
2) but表示對照或對立時,一般都比較輕鬆自然,而yet在表示對照或對立時,則往往比較強烈,時常出人意料；
3) but在某些習慣說法中不可用yet替代.例如： This is strange and yet true.（正）這是奇怪的,但是真的. This is strange and but true.（誤） She is American but she speaks Chinese very fluently. 她是美華人,但她說中文說得非常流利.（自然輕鬆的比較或對立） She is American,yet she knows little about American history. 她是美華人,但她卻對美國曆史知之甚少.（較強烈的比較或矛盾） A:"Let"s have another try."讓我們再試一次. B:"But how?"但是怎樣試呢?（習慣表達法,不用yet） It is true that he is young,but he is diligent and honest. 誠然他年輕,但是他勤奮,而且誠實.（同it is true,of course,indeed等連用習慣上用but）Note:1.never…but意為when…always.例如： It never rains but it pours.不雨則已,一雨傾盆.2.在not such…but,so…but句型中,but相當於that…not.例如： He is not such a fool but he knows it. No task is so hard but (but that ) he can accomplish it.3.在 I do not doubt but (but that）,I do not deny but (but that),It is not impossible but (but that )句型中,but或but that無意義,相當於連詞that.4.only亦可用作並列連詞,意為,“但是,只是”,常用於口語中,相當於but,前面可用逗號或分號.例如： He has promised to do it,only he does not keep his word. 他已答應做那件事了,只是他不守信用.5.still可以用作並列連詞,意為“但是,然而”,前面用逗號或分號均可.例如： Autumn is come,still it is rather hot. 秋天到了,但是天氣仍然很熱. She failed; still she did not lose heart. 她失敗了,但她並沒有灰心.6.still,yet,however,nevertheless常可換用,however語氣較弱,常作插入語用；yet,still 和nevertheless常表示強烈的對比或相反的結論.例如： I can not,however,approve of your design.7.and yet和but yet是yet的變體,與but同義.轉折的表示法還有：indeed…but；It is true…but; to be sure…but; while,whereas (=but on the contrary) ; on the contrary; on the other hand等.例如： Some people like fat meat,whereas others hate it.