表示转折或对比的并列连词有：
1.but
He tried hard but he was unsuccessful.他做了很大努力但没有成功.
2.yet
The car was old,yet it was in excellent condition.这辆车子很旧,但仍处于良好的状态.
3.however
She felt ill.She went to work,however,and tried to concentrate.她病了.然而她照旧去上班,并且尽力集中精神工作.
4.nevertheless
I don't know anything against that man; nevertheless I don't trust him.我对那个人没有什么不良的看法,但我不能信赖他.