Question

What are collocations? Differentiate between usual and unusual collocations.

Answer 1

appear on the group of birds is known as collocation

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Answer 2

A collocation is a group of words that usually go together. For example, in English, we usually say 'heavy rain'. It's correct grammatically to say 'strong rain' or 'big rain', but both of these sound completely strange.  If you use the normal collocation ('heavy rain') your English will sound a lot better and more natural and it will be easier for native speakers to understand you.