n. 他們是否接受那合同還說不準. Their acceptance of the contract is still in doubt
v. 他反覆思量是否該（嚮她）求婚. He was trying to decide whether he should propose (to her).
v. 他否認與己有關. He denied that he was involved
v. 他否認知道此事. He denied knowing anything about it
v. 他對是否參加考察隊仍拿不定主意. over whether to join the expedition
n. 他對著鏡子看領帶是否係正. He looked in the glass to check that his tie was straight
v. 他總是不斷反省是否言行合理. He's constantly rationalizing
n. 他是否適合該工作有些疑問. There's some doubt about his suitability for the job
n. 他最好保持沉默, 否則...! leave a bad/nasty taste in the mouth => leave1. live from hand to mouth => live2. look a gift horse in the mouth => gift. out of the mouths of babes and `sucklings (saying 諺) children often speak wisely 黃口小兒的話也常有道理. put one's money where one's mouth is => money. put words into sb's mouth => word. shoot one's mouth off => shoot1. shut one's mouth/face => shut. shut sb's mouth => shut. take the bread out of sb's mouth => bread. take the words out of sb's mouth => word. He'd better keep his mouth shut, or else...!
n. 他的這一决定是否合乎道德規範值得懷疑. The ethics of his decision are doubtful
n. 他給我寫了個便條, 問我是否能來. He wrote me a note asking if I would come
n. 他那些怪話使我們心中生疑, 不知他精神是否正常. His strange remarks planted doubts in our minds about his sanity
adj. 以下的否定形式和疑問形式是古雅的或者是正統的形式 The following negative and question patterns are old-fashioned or very formal
n. 優先取捨權（决定是否接受某事物的優先權） the refusal [sing] right to accept or refuse sth before it is offered to others; option
n. 你今天在辦公室是否忙得不可開交? Have you had a hard day at the office?
conj. 你們想喝點東西嗎?＇）他問我們是否要喝點東西. if we wanted a drink. （｀