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(1)是否(if)：He asked me/didn't know～he should make the last attempt. 他問我/不知道是否應該做最后的努力。I wondered～to go to work or (to) stay at home. 我不知道是去上班還是待在家里。He wasn't sure/certain～he ought to leave or stay. 他不能肯定他是應該走，還是應該留下。The decision～to see her was mine alone. 是否去看她是我個人的決定。It all depends on～you can offer me the chance. 這完全取決于你是否給我機會。Don't hesitate about～to accept or decline his invitation. 不要對是接受還是拒絕他的邀請而猶豫不決。W～it will do us harm or good remains to be seen. 這事對我們有害還是有益尚待觀察。It was uncertain/doubtful～she would recover. 無法肯定/難以預料她是否能康復。The point is～on his merits we ought to recommend him. 關鍵的問題是我們是否應根據他的優(yōu)點來推薦他。

(2)不管……還是(no matter if)：We'll take the next offer，～good or bad. 我們將采納下一個提議，不管是好是壞。W～from bravery or stubbornness，they did not give in. 不管是出于勇敢還是固執(zhí)，他們畢竟沒有屈服。I shall go，～you come with me or stay at home. 不管你跟我去還是留在家里，我都要去。W～you support me or～they oppose me，I shall do it. 不管你支持我還是他們反對我，我都要做的。All substances，～it be gas， liquid or solid， are made up of atoms. 所有物質，不管是氣體、液體還是固體，都是由原子組成的?！玝y accident or design 無論是出于偶然還是有意為之;～by skill or luck 無論是靠能力還是靠運氣;～through choice or obedience 無論是出于自愿還是由于順從;

whether or not 是否： Can you tell me～or not the train has left(～the train has left or not)? 請問火車是否開走了? The police will find it out，～you confess or not. 不管你招認與否，警察都會查個水落石出。

【辨異】whether 與 if 的區(qū)別見IF。

【用法】 1)whether 一般用于從句或不定式前，表示選擇; 2)whether與if在意思上相同，都用于間接疑問句，提供選擇或要求回答yes或no;但在下列情況下if不能取代whether。1)在動詞不定式之前，如：The trouble is whether to speak the truth or to tell a lie.(問題是講實情還是說謊。) 2)在介詞或名詞之后，如：It depends on whether he tells the truth or not.(完全取決于他是否講實情。) The question whether we ought to call for a doctor was not answered. (沒人回答是否叫大夫的問題。) 3)在whether or not 的短語中，如： The police asked him whether or not he would tell the truth.(警察詢問他是否講實情。)4)在主語從句中，Whether he tells the truth or a lie is all the same to me.(他講實情還是說謊對我來說都無所謂。) It's his right whether he tells the truth or a lie.(講實情還是說謊是他的權利。)