 Hello, here is a quick introduction to a more advanced frequency search in the British National Corpus. Let's say we want to find all verbs that are introduced by the prefix EN. In order to do this, we need the frequency list option, where the word pattern input box allows us to select the initial letters of our target item. So, let's type EN here. But as you can see, the result is not what we want. The first six items are neither verbs nor are they introduced by a prefix. So, let's return and modify our search option. For example, we could restrict the search result to a particular part of speech. So, let's select any verb and start the search again. Now, the result is much better. However, our list still contains verbs where EN occurs initially, but is not a prefix. Another option might help here. Using the so-called POS, the part of speech tags themselves, that is, particular character combinations that are used within BNC text documents, our search result becomes much more refined. In our case, we can select VVI for verbs in their infinitiable form, and now we will get almost only those elements we want. Still, EN and ENTER are among the search results, but the total list of elements found can now easily be handled. By the way, the list of POS tags can be found in all morphology classes on the virtual linguistics campus. So, in summary, the POS tag search option in combination with the frequency list search is a highly useful option in the British National Corpus. Thanks and see you again.