but是連詞,表示（較強(qiáng)的）轉(zhuǎn)折,連接兩個(gè)句子時(shí)只用加逗號.例如：I love her,but she doesn't love me.
however是副詞,也表示（較強(qiáng)的)轉(zhuǎn)折,但連接兩個(gè)句子時(shí)要用分號,而且在這個(gè)詞后還要加逗號.例如：I love her; however,she doesn't love me.或者將兩句子分開寫.例如：I love her.However,she doesn't love me.
while作連詞使用時(shí),表示（較弱的）轉(zhuǎn)折,連接兩個(gè)句子時(shí)用逗號,但兩個(gè)句子的主語不一樣.例如:I like singing,while my sister likes dancing.
yet作連詞使用時(shí),也表示（較弱的）轉(zhuǎn)折,連接兩個(gè)句子時(shí)也用逗號,但兩個(gè)句子的主語是一樣的.例如：He has a good job,yet he never seems o have any money.