Grammar is the whole system and structure of a language or of languages in general, usually taken as consisting of syntax and morphology. British English (BrE) is the form of English used in the United Kingdom. It includes all English dialects used within the United Kingdom.
American English (AmE) is the form of English used in the United States. It includes all English dialects used within the United States. Standard English (S.I.) is whatever form of the English language is accepted as a national norm in an Anglophone country. Learn more about how to successfully teach Grammar in your ESL classroom.
Resources:
Lanternfish
Marisa Constantinides – TEFL Matters
Grammarman Comic
Daz English – Let’s Talk Class
An A-Z of ELT
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Visit Shelly Terrell’s Teacher Reboot Camp