舞言李萍
if
读音:[ɪf]、 美 [ɪf]
释义:
conj. 是否;如果;即使;每当。
n. 条件;设想。
语法:
if作为从属连词,可引导条件状语从句、让步状语从句和名词从句。
if引导条件状语从句,从句可为真实条件从句,也可为虚拟条件从句。如为真实条件从句,谓语用陈述语气,表示可能性很大,作“假使”“如果”解,通常用一般现在时代替一般将来时; 如果if从句中用will,表示意愿。
从句如为虚拟条件从句,谓语动词要用虚拟语气,表示可能性不大或与过去事实相反,作“要是,假如”解。可指过去的情况,也可指现在和将来的情况。指将来情况时可用were to或should。在现代口语中,一、三人称后常用was代替were。
S素年錦時
一、引导宾语从句\x0d\x0a这时两者的含义区别很小,一般可通用.\x0d\x0aI don't know whether/if they will come to help us.\x0d\x0a但是,当whether与or not连成一个词组时,whether不可换用if.\x0d\x0aI don't know whether or not they will come for our help.\x0d\x0a若whether和or not不连在一起,在口语中可以用if取代whether,当然也可以用whether.\x0d\x0aI don't care if/whether your car breaks down or not.我不在乎您的车是否是会出故障.\x0d\x0a此外,还有三种情况值得注意:\x0d\x0a(1)在介词后面只能用whether,不能用if.\x0d\x0aI am not interested in whether you'll come or not.\x0d\x0a(2)在动词不定式之前,只能用whether,不能用if.\x0d\x0aHe doesn't know whether to stay or not.\x0d\x0a(3)在及物运动discuss后的宾语从句中,只能用whether,不能用if.\x0d\x0aWe discussed whether we should make a change in our plan.\x0d\x0a二、引导主语从句\x0d\x0a只能用whether,不能用if.\x0d\x0aIt is unknown whether he will come.\x0d\x0aWhether the news is true remains a question.\x0d\x0a三、引导表语从句\x0d\x0a只能用whether,不能用if\x0d\x0aThe question is whether they can take our advice.\x0d\x0a四、引导同位语从句\x0d\x0a常用whether\x0d\x0aThe question whether he'll come is unknown.\x0d\x0a五、可以用来引导一个否定的宾语从句,whether则不能用来引导否定的宾语从句,因为它表示正反两方面的选择意义比较强.\x0d\x0aTell me if it is not going to rain,please.\x0d\x0a六、if除引导宾语从句外,还可以引导条件状语从句,作“是否”解.在容易引起混淆产生歧义的情况下,就不可用if,而须用whether.\x0d\x0aPlease let me know if you intend to come.这个句子有两种解释:A:“请让我们知道你是否想来.” B:“如果你打算来,请让我们知道.”在书面语中,如果我们想表达的第一种含义,就得用whether来改写第一句.\x0d\x0aPlease let me know whether you intend to come.\x0d\x0a通俗来讲,whether在大多数情况下都可以用,而if则不然,有wether和if时一般选wether不会有错,但是如果所需的意思是"如果",自然只能选if了
o0大鹏0o
1、wheather
英 [ˈweðə(r)] 美 [ˈweðər]
conj.(表示迟疑或两个可能性之间的选择)是否;(表示两种情况都真实)是…(还是),或者…(或者),不管…(还是)
例句:You can find out whether they are prepared to share the cost of the flowers with you
你可以弄清楚他们是否愿意和你一起分担买花的费用。
2、if
英 [ɪf] 美 [ɪf]
conj.如果;假若;倘若;当;无论何时;每次;与will或would连用,表示客气地请求
n.不确定的情况
例句:He asked in his Germanic English if I was enjoying France.
他操着一口带有德国腔的英语问我在法国玩得是否愉快。
whether和if的区别
这两个连接词均含“是否”之意。
if作“是否”解时,多用于口语,引出宾语从句,不能直接跟or not连用。
whether多用于书面语中,可与or或or not连用,除引出宾语从句外,还可引出主语从句、表语从句、同位语从句或与不定式连用。whether与discuss、consider和decide等动词连用听起来更自然。
例句:Not all women have the choice whether or not to breast-feed their babies
不是所有的妇女都能选择是否用母乳哺育自己的孩子。
excellentpri
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.