I teach Business English, and what I do is I incorporate legal terms and some vocabs they might use in conducting business, just common ones : loan, minutes, log. Also, I show them how and when it’s used, when is it likely to be picked up and have them practice using the words introduced.

Business English uses the same grammar as other English writing and speaking. However, every type of business has its own vocabulary (business terms). The terms used in different types of business can be learned by studying glossaries. For example, the terms used in financial businesses can be seen by searching the internet for "glossaries of terms used in financial businesses". Hope this helps.

Some teachers like me offer Business English classes exactly for this purpose ☺️