是否的英文：
whether (or not)
if
is or isn't
参考例句：
BRAKES: Are your brakes mushy?
刹车:刹车是否失灵？Is this inference too presumptuous?
这种推论是否太抽象了？Does the writer belong to the Impressionist school?
这位作家是否属于印象派?There' s some ifs about his suitability for the job.
他是否适合该工作有些疑问. Has operator received pump instruction and operations manual?
操作者是否收到泵说明书和操作手册?Look through your old clothes and see if you have anything to give away.
翻翻你的旧衣服，看看是否可以送掉的。Litmus paper can be used as an indicator of the presence of acid in a solution.
石蕊试纸可用以测试溶液是否含酸。Can children under six ride free?
6岁以下儿童是否免费Disputing the country's title to the islands
争论该国对那些岛是否有主权.Please reenter your passwords to confirm they are correct.
请再次输入密码，确认是否正确。
whether是什么意思：
conj. 是否；不管是...（或是）
The moon is a moon whether it shines or not
或名或暗,月亮总是月亮Whether to go or not is up to you.
去还是留由你自己决定。It is questionable whether it is true.
它是否真实值得怀疑。 The key element in whether scientific evidence is admissible is whether it is trustworthy.
isn是什么意思：
internal statement number [计] 内码
That book isn't mine.
那本书不是我的。Money isn't everything
钱不是万能的It isn't the crack of doom.
还不是世界末日。 Boy! Isn't it hot!
哇，好热啊！“Stop!” isn't an imperative.
肉祖宗想切肉
