很多同学在备考雅思口语的时候可能都会有这样的疑问，雅思口语考试到底能不能用习语?
Examiner：
It really depends on the context, and there are various types of idiom. I'd definitely avoid saying "it's raining cats and dogs" because no English speakers really use this expression nowadays. My dictionary defines an idiom as "a group of words whose meaning is not deducible from the meaning of each inpidual word". This means that you cannot understand an idiom by analysing it word for word. For example, "it's a piece of cake" means "it's easy". Phrasal verbs are also idiomatic expressions (e.g. "look up" can mean "search in a dictionary").
考官说：由于有各种各样的习语，能不能在雅思口语考试中用习语，一定要视情况而定。我一定不会在考试的时候说"it's raining cats and dogs"，因为现如今已经没有人再讲这个词组了。来看看字典里面“习语”的定义：不能从字面意识推断出整体含义的词组。这就意味着你不能把词组里面的单词一个一个去看。比如："it's a piece of cake"的意思是"it's easy"。有的时候，动词短语也是习语，如"look up" 有时意味着"search in a dictionary"。
Using idioms
English speakers use idioms all the time in conversation, but less so in formal/academic speaking and writing contexts. However, we often write things like "focus on an issue" or "the key to solving a problem" and here we are using 'focus' and 'key' in a figurative or idiomatic way.
关于习语的使用，母语为英语的人在对话中会经常使用习语，但是很少会用在正式的学术考试中。然而，我们经常会写出类似"focus on an issue" 或者 "the key to solving a problem"的短语，这里的'focus' 和 'key'也是习语表达。
Idioms in IELTS
You need to be really careful when using idioms in your IELTS test. Please don't learn lists of idioms; if you use them in the wrong way, your speech/writing will seem forced and unnatural. Also, remember that many idioms are informal or clichéd.
关于雅思考试中能否用习语，你在使用的时候需要非常小心。不要背诵习语词汇列表，因为如果你不知道它的用法而乱用的话，你的表达会让人觉得特别不自然。而且，大多数习语都是特别不正式而且非常过时的。
So, what should you do? Read my tip：
You can only be sure that you are using an idiom correctly if you have seen or heard it used in context. For example, if you've read about someone who "set up a business", you can use that phrase with confidence (and it might help your score). If you've only seen the idiom on a list, don't use it.
那么你们该怎么做呢?来看下我的建议吧：习语只有在你在其它地方见过或听说过并且非常了解它的用法的情况下才可以使用。比如，如果你有读到过某个人"set up a business"，那么你就可以用在雅思考试中。如果你只是在习语词汇列表中背诵过，那么不要用。
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