He always does the work, but in his own sweet time.
He tried to save it, but in vain.
这两句话中,but词性为连词吗?连词的话前后内容可以不并列吗?
But 在此的词性依旧是连词。
张道真《现代英语用法词典》第 174 页:
(but)间或引起状语等:
He tried to save it, but in vain. (Sinclair)
He worked hard but without any success. (Eckersley)
She glanced quickly about, but seeing only the empty room. (Dreiser)
另:In
Britain the government advises people to wear masks, but to little effect. (The Economist)
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