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IELTS BNC: 986 COCA: 2026
useful
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adjective /ˈjuːsf(ə)l/
  1. 1
    helpful for doing or achieving something 有帮助的；有用的；有益的

    Here's some useful information about travel in Canada. 这是一些关于在加拿大旅行的有用信息。

    a useful tool/technique/gadget 有用的工具/技术/小机械

    Her book is a useful contribution to our understanding of how Mozart worked. 她的书对于我们了解莫扎特是如何工作的大有帮助。

    useful to :

    I was useful to them because I could speak French. 由于我会说法语，所以对他们有帮助。

    useful for :

    That basket would be useful for picnics. 那个篮子会对野炊很有用。

    useful for doing something :

    Old pictures are useful for seeing how people used to dress. 老照片对了解人们过去的穿着很有帮助。

    useful (for someone) to do something :

    Thanks. It's useful to know that. 谢谢，知道那件事很有帮助。

    Would it be useful for you to ask us some questions? 你问我们一些问题会有帮助吗？

    prove useful :

    Keep a record of everything that might prove useful. 把任何可能证明有用的东西都记录下来。

     Synonyms and related words
    Useful and effective and working correctly: useful, efficient, effective...
  2. 2
    British informal good, or skilful 好的；熟练的

    a useful player 出色的运动员

     Synonyms and related words
    Skilful and able: able, capable, professional...
  3. From our crowdsourced Open Dictionary
    3
    as useful as ... used for saying that something is completely useless

    He's about as useful as a chocolate teapot.

    All this packaging is about as useful as a screen door in a submarine.

    Submitted from United Kingdom on 22/03/2018
     
Get It Right!: useful
Although the adjective full ends with a double ‘ l', adjectives like useful have only one ‘ l':
✗ Find a more usefull spare time activity than driving around in a car.
✓ Find a more useful spare time activity than driving around in a car.
Other adjectives ending in -ful are also written with only one ‘ l', for example:
careful, faithful, harmful, helpful, meaningful, painful, powerful, skilful, successful
Note however that adverbs formed from these adjectives are written with double ‘ l', for example:
carefully, faithfully, helpfully, usefully etc

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