关于UnlessUnless表示if not.在新概念三第一课里有一句...,and experts confirmed that a puma will not attack a human being unless it is cornered.原句不是有个not了吗?把原句改成if not的形式怎么改呢?有这个疑问是因
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![关于UnlessUnless表示if not.在新概念三第一课里有一句...,and experts confirmed that a puma will not attack a human being unless it is cornered.原句不是有个not了吗?把原句改成if not的形式怎么改呢?有这个疑问是因](/uploads/image/z/13510301-5-1.jpg?t=%E5%85%B3%E4%BA%8EUnlessUnless%E8%A1%A8%E7%A4%BAif+not.%E5%9C%A8%E6%96%B0%E6%A6%82%E5%BF%B5%E4%B8%89%E7%AC%AC%E4%B8%80%E8%AF%BE%E9%87%8C%E6%9C%89%E4%B8%80%E5%8F%A5...%2Cand+experts+confirmed+that+a+puma+will+not+attack+a+human+being+unless+it+is+cornered.%E5%8E%9F%E5%8F%A5%E4%B8%8D%E6%98%AF%E6%9C%89%E4%B8%AAnot%E4%BA%86%E5%90%97%3F%E6%8A%8A%E5%8E%9F%E5%8F%A5%E6%94%B9%E6%88%90if+not%E7%9A%84%E5%BD%A2%E5%BC%8F%E6%80%8E%E4%B9%88%E6%94%B9%E5%91%A2%3F%E6%9C%89%E8%BF%99%E4%B8%AA%E7%96%91%E9%97%AE%E6%98%AF%E5%9B%A0)
关于UnlessUnless表示if not.在新概念三第一课里有一句...,and experts confirmed that a puma will not attack a human being unless it is cornered.原句不是有个not了吗?把原句改成if not的形式怎么改呢?有这个疑问是因
关于Unless
Unless表示if not.在新概念三第一课里有一句...,and experts confirmed that a puma will not attack a human being unless it is cornered.原句不是有个not了吗?把原句改成if not的形式怎么改呢?有这个疑问是因为看到一个选择题:
A:May I have the loan?
B:( )you offer good security.
A.But B.Unless C.Provided(if,正式) D.But for(要不是,虚拟)这里选C,因为B的话,对话就变成如果你不提供好的信用,你不可以贷款.
可能没说得很明白.呵呵
关于UnlessUnless表示if not.在新概念三第一课里有一句...,and experts confirmed that a puma will not attack a human being unless it is cornered.原句不是有个not了吗?把原句改成if not的形式怎么改呢?有这个疑问是因
给你下文吧:
UNLESS :
Not unless you offer good security.
PROVIDED:
(意味着 Yes,of course)Provided you offer good security.
注意:如果你要用 unless 前面非有 not 不可,明白吗?
More context for you,hope it helps:
Can I lend/use your computer?
A:Provided you don't damage it.
B:Not unless you promise/swear you won't damage it.
unless在意义上相当于if…not…,因此在有些场合if…not…可为unless所代替。
但在有些场合又不能互换,我们要注意下面几种情况:
1.当if…not…引导非真实条件分句时,一般不可改用unless。 例如:
If she had not had an alarm clock,she would have missedthe train.(事实:她有闹钟。)<...
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unless在意义上相当于if…not…,因此在有些场合if…not…可为unless所代替。
但在有些场合又不能互换,我们要注意下面几种情况:
1.当if…not…引导非真实条件分句时,一般不可改用unless。 例如:
If she had not had an alarm clock,she would have missedthe train.(事实:她有闹钟。)
如果把上述例句中的if…not…换成unless,意义就相反了。
(误)Unless she had had an alarm clock, she would havemissed the train.(事实:她没有闹钟)
2.If…not…引导的条件分句可以重叠使用,unless则不可, 因为unless表示唯一条件。例如:
She won't lose weight if she doesn't keep a diet and ifshe does not take exercise every day.
3.unless引导的分句可用否定结构,而if…not …引导的分句不可再否定。例如:
Don't ask me to explain unless you really don't understand.
The directors have a meeting every Friday,unless there is nothing to discuss.
以上两例句中的unless不可换成if…not…。
4.在unless引导的肯定形式的条件分句中, 通常用肯定词(即some,already,still,too,as well等),在if…not…引导的分句中,通常用非肯定词(即any,yet,ever,either,at all等)。例如:
I will criticize you if you haven't spoken to her yet.
I will criticize you unless you have already spoken to her.
(误)…unless you have spoken to her yet.
不过在否定形式的非真实条件分句中,if…not …结构仍能与肯定词连用。例如:
If he hadn't already prepared his lesson, he wouldn't beallowed to go.(因为这种从句表面上是否定,实际上是肯定。)
5.在间接引语中,当if=whether,意为“是否”,unless 不可以代替if…not…。例如:
She promised to let me know if she wasn't coming.
6.当unless含有“除了”的意思,不可为if…not…所替代。例如:
He never stammers,unless when he is angry.( unless when=except when)
Nothing will come out of it, unless disaster.(unless=except)
7.当主句是疑问句时,不可用unless代替if…not…。 因为unless用在A情况发生,必导致B结果之类的复合句中。例如:
What shall we do it they don't reply to our letters?
8.当主句谓语是be+某些形容词或分词,如:glad,surprised,disappointed,satisfied,ashamed,delighted和pleased等, 不可用unless代替if…not…。例如:
I'll be really surprised if they don't come to the meeting.
I'll be quite glad if she doesn't join them.
之所以不能为unless代替,是强调否定条件的出现,表明在这种前题下的因果关系。以上条件状语从句都可变为原因状语从句。例如:
I'll be really surprised that they won't come to the meeting.
这里if被that代替了,而从句的否定结构不变。
综上所述,unless既等于if…not…,在某些场合又不相等, 因此要牢记它们之间的差别,准确地使用它们。
收起
unless表示除非,近义词 if not
选择题选b,unless强调了贷款条件