There are differences in language by native English speakers n different parts of the world.
It is often necessary to understand the different phrases used by British and American native speakers in particular.

Here are some basic ones very relevant for business English:

Bibliography and recommended material:

Books:
-In Business photocopiable material by Cambridge.
-Business Grammar Builder by Macmillan.
-Business Class by Longman.
-The In Company series by Macmillan.