1.however作副詞用時(shí),表示“然而；但是”,可以位于句首、句中和句末；位于句首時(shí),要用逗號(hào)與句子其它部分隔開；位于句中時(shí),其前后都要用逗號(hào)；位于句末時(shí)其前用逗號(hào)分開.例如:
She felt ill.She went to work,however,and tried to concentrate.
她病了.然而她照舊去上班,并且盡力集中精神工作.
His first response was to say no.Later,however,he changed his mind.
他最初的反應(yīng)是不同意,可是后來他改變了主意.
2.however與but 兩者都做“但是,然而”講,而且都引出并列句.從語義上看,but所表示的是非常明顯的對(duì)比,轉(zhuǎn)折的意味較however要強(qiáng).從語序上看,but總是位于所引出的分句之首,而however卻可位于句首、句中和句末,同時(shí)從標(biāo)點(diǎn)符號(hào)上看,but之后一般不得使用逗號(hào),而however則必須用逗號(hào)與句子其它部分分開.例如：
I thought those figures were correct.However,I have recently heard they were not.
我原以為那些數(shù)字正確無誤,不過我最近聽說并不正確.
3.however的其它用法：however可以作連詞(conj.),表示“無論以何種方式,不管怎樣”,引導(dǎo)讓步狀語從句.例如：
You can travel however you like.你可以隨心所欲地去旅行.
However I approached the problem,I couldn’t find a solution.
這一問題我不管怎樣都無法解決.