Concordance: analyzing a body of sample language (a corpus) to determine common usage
1. Fantastic! Three great concordance samplers which can access the biggest and most famous corpuses (including the British National Corpus) are:
British Academic Written English concordancer
British Academic Written English Corpus
2. Make your own concordance! Laurence Antony at Waseda University made Antconc, a free software for making your own concordance.
3. Google can be a simple concordancer too: