The COCA Corpus, developed by Mark Davies at BYU, is a powerful tool for language learning and teaching (among other discilpines). This interactive tutorial website will walk users through the basic functionality of the COCA Corpus. It is designed with language teachers in mind (as opposed to learners).
The COCA corpus (new version released March 2020). The corpora from English-Corpora.org are the world’s most widely-used corpora. The Corpus of ContemporaryAmerican English (COCA) is by far the most widely-used of these corpora. In early 2020, we dramatically expanded the scope and size and features of COCA to make it even more useful for researchers, teachers, and learners.The corpus contains more than one billion words of data, including 20 million words each year from 1990-2019 (with the same genre balance year by year). This makes COCA the only corpus of English that is 1) large 2) recent and 3) has a wide range of genres.
There are six main ways to search the corpus:
1. Search for phrases and strings. And because the corpus is optimized for speed, searches for substrings (*ism, un*able) and phrases are very fast, e.g.: got VERB-ed, BUY * ADJ NOUN, "gorgeous" NOUN -- and even high frequency phrases like: from ADJ to ADJ, phrasal verbs, or NOUN NOUN.
2. Browse a frequency list of the top 60,000 words in the corpus, including searches by word form, part of speech, ranges in the 60,000 word list, and even by meaning or pronunciation. This should be particularly useful for language learners and teachers.
3. Browse through the Academic Vocabulary List (AVL) (Gardner and Davies, 2013), and then see detailed entries for each of the 3,000 words. This is a great option for those who are interested mainly in academic English.
4. Search by individual word, and see collocates, topics, clusters, websites, concordance lines, and related words for each of these words. Note that some of these searches are unique to COCA and iWeb.
5. Input entire texts and then use data from COCA to get detailed information on the words and phrases in the text.
6. Find random words and also browse through randomly-selected "Words of the Day", and then save new words and come back and review them later.
You might pay special attention to the comparisons between genres and years and virtual corpora, which allow you to create personalized collections of texts related to a particular area of interest.