n. 他们是否接受那合同还说不准. Their acceptance of the contract is still in doubt
v. 他反覆思量是否该（向她）求婚. He was trying to decide whether he should propose (to her).
v. 他否认与己有关. He denied that he was involved
v. 他否认知道此事. He denied knowing anything about it
v. 他对是否参加考察队仍拿不定主意. over whether to join the expedition
n. 他对著镜子看领带是否系正. He looked in the glass to check that his tie was straight
v. 他总是不断反省是否言行合理. He's constantly rationalizing
n. 他是否适合该工作有些疑问. There's some doubt about his suitability for the job
n. 他最好保持沉默, 否则...! 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 谚) children often speak wisely 黄口小儿的话也常有道理. 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. 他的这一决定是否合乎道德规范值得怀疑. The ethics of his decision are doubtful
n. 他给我写了个便条, 问我是否能来. He wrote me a note asking if I would come
n. 他那些怪话使我们心中生疑, 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问形式是古雅的或者是正统的形式 The following negative and question patterns are old-fashioned or very formal
n. 优先取舍权（决定是否接受某事物的优先权） the refusal [sing] right to accept or refuse sth before it is offered to others; option
n. 你今天在办公室是否忙得不可开交? Have you had a hard day at the office?
conj. 你们想喝点东西吗?＇）他问我们是否要喝点东西. if we wanted a drink. （｀