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1.yet：而，然而，可是。属副词作并列连词用，语气比but强烈，可与and，but连用。
eg：He said he would be late, yet he arrived on time.

2.but：但是。用来引出相反意见或不同情况，常用于口语中。连接两个并列的成分或句子，语气较强，在意义上构成明显的对比。与前分句可用（可不用）逗号，与后分句不用逗号。
eg：Life is limited but there is no limit to learning.

3.on the contrary：相反。可连接同向句子或反义句子。
当连接同向句子时，表示递进，相当于rather, instead；
eg：That the artist chose to remain in his hometown does not mean that he remained provincial; on the contrary, he kept abreast of the international artistic movements of his day.
当连接反义句子时，表示转折，即与先前的看法相反；
eg：When I first met him, I thought he was a modest and gentle person. On the contrary, he is arrogant and ruthless.

4.even though：尽管；虽然。引导让步状语从句，用来引出一个真实、但出乎意料的情况，可用于句首或带有动词的从句开头。
eg：Even though everyone played well, we lost the game.
=We lost the game, even though everyone played well.

5.however：然而，不过。位置句首、句中，用逗号隔开；语气比but 弱，不直接引出相反意见。常用作副词。
eg：It' s raining hard, however, I think we should go out.
希望对同学有帮助，祝学习进步！