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90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
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Here's some useful information about travel in Canada.
a useful tool/technique/gadget
Her book is a useful contribution to our understanding of how Mozart worked.
I was useful to them because I could speak French.
That basket would be useful for picnics.
Old pictures are useful for seeing how people used to dress.
Thanks. It's useful to know that.
Would it be useful for you to ask us some questions?
Keep a record of everything that might prove useful.
This is the British English definition of useful. View American English definition of useful.